The Ultimate List Of Best Square Drill Bit | Top 10 Favorites

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You deserve the best square drill bit you can afford, right? Well, we think so too. We took our time to research and evaluate the top-rated square drill bit on the market today so that you won’t have to. Our professional editors scoured hundreds of products and assessed scores and consumer ratings from reputable sources, just to name a few.

Through thorough analysis of these products and consumer ratings, they could sift through the overwhelming amounts of online information. So you don’t have to trawl through dozens of vendor’s sites looking for the best one. We hope it can make your search for the best square drill bit easier and less stressful.

Best square drill bit: By Overall Editor’s Score

Best square drill bit Reviews & Buying Guide

There are several features to consider when choosing a square drill bit, and with so many options available, picking the right one can feel overwhelming. Like any other square drill bit, shoppers want a stylish option, so we kept aesthetics in mind when choosing the best square drill bit. An attractive square drill bit doesn’t need to come at a high cost, so we made sure to choose several affordable options.

Durability is top of mind, especially when choosing square drill bit. A good square drill bit should last several years, so we ensured our top picks were durable. Through extensive product research, we chose square drill bit made of sturdy materials to withstand water and sun exposure seasonally. We selected each square drill bit based on some major criteria, including:

  • Overall performance
  • Build Quality
  • Material
  • Functionality
  • Ease of use
  • Durability
  • Design
  • Affordability
  • Price to value ratio
  • Versatility
  • Customer reviews
  • Customer service
  • Brand value, etc.
No. 1
Robertson Square Drill Bit Set (10 Pack - 2.3" Long Magnetic Heads) Square Screwdriver Bit Sizes: #0, 1, 2, 3, and #4 (2 of Each Size)
  • INDUSTRIAL GRADE S2 STEEL WITH MAGNETIC TIPS - Our Drill Bits Are Made From High Quality S2 Steel Material in a Beautiful Black Finish. Also Each Drill Bit is Labeled with it's Square Bit Size.
  • ROBERTSON SQUARE BIT SET ARE PERFECT FOR SO MANY USES - Square Bits Are Commonly Found on Appliances, Air Conditioners, Printers, Deck Screws, Dirt Bikes, Chainsaws, Auto Parts, Computers and Other Electrics, and So Many Others.
  • LIFETIME GUARANTEE - Here at Owl Tools (USA Based Company) we only care about your satisfaction. We try our best to ensure each product is in perfect condition before you get it, but if something is not up to your satisfaction, please contact us for a full refund or replacement.
  • ROBERTSON SQUARE DRILL BIT SET - 10 Piece Set in the Following Sizes #0, #1, #2, #3, and #4 (2 of Each Size)
  • CONVENIENT PLASTIC STORAGE CASE - Our Drill Bits Come in a Durable Locking Plastic Storage Case for Easy Storage
No. 2
6pcs Square Hole Mortise Chisel Drill Bit Tools, 5/8" 9/16" 1/2" 3/8" 5/16" 1/4" HSS Woodworking Hole Saw Mortising Chisel Drill Bit Set, Different Sizes
  • It can be used with mortise and tenon machine to achieve double effect
  • Size of this Square Hole Mortise Chisel Drill Bit set: 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm),1/2 Inch (12.7mm), 5/8 Inch (16mm), 9/16 Inch (14mm)
  • Material: Heat treatment, HRC48~50 high-speed steel.
  • Suitable for all mortise and drill accessories
  • Reduce the labor intensity of construction workers, accelerate the construction speed, reduce the construction cost of construction, installation, decoration, decoration industry.
No. 3
Square Hole Drill Bit, Steel Hardness Sharp Durable Mortising Chisel Set 1/2-Inch, 1/4-Inch, 3/4inch, 3/8-Inch, 5/8-Inch, 5/16-Inch, 9/16-Inch Woodworking Mortiser Drill Bit-7pcs
  • 【Sharp】-These square hole drill bits made of bearing steel, hardness 56HRC, lengthened core, sharp cutting edge, continuous blade, quick cuttings, high efficiency. Note: If for drill press to use, must have a mortising attachment (Not Included).
  • 【After- sale Service】Unique service can make you rest assured to buy--(1)Warranty 14 months,a warranty system, to provide repair parts. (2) Professional sellers, and professional guidance, have more tool accessories to choose. (3)Provide professional use tutorials. (4) Often give away free tool products (because we clean stock). Please contact us if you need any of the above services.
  • 【Different Size】Drills precise holes with little pressure -- Using different specifications of the square hole drill, matching the appropriate power of the square hole machine, you can play a square hole to meet the requirements - 1/2-Inch(12.7mm), 1/4-Inch(6mm), 3/4inch(19mm), 3/8-Inch(9.5mm) , 5/8-Inch(16mm), 5/16-Inch(8mm), 9/16-Inch(14mm).
  • 【Very cost-effective】-- Mortise and tenon square hole drilled by SaferCCTV + outer sleeve in the middle of the combination Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industrie
  • 【Easy to use】Our woodworking morstising chisel bits set Only use for the opening square hole and keyhole drill -- Square hole drill can not be used on an electric drill, bench drill, drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use.
No. 4
WSOOX Square Hole Drill Bits for Wood, Woodworking Hole Saw Mortising Chisel Drill Bits (Size: 1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch)
  • 🔨【Drill Bits Sizes】Drill bits diameters: 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 1/2 Inch (12.7mm).
  • 🔨【After-sale Service】WSOOX tools store provide customers with quality but affordable tools. If you have any problem with these square hole drill bits, please contact us feel free and we will reply you within 24h.
  • 🔨【Easy to Drill】The carbide drill bit tipped is sharp and wear-resistant. With high hardness and long service life. The drill sleeve has a U-shaped design to facilitate the discharge of wood chips and improve the drilling efficiency.
  • 🚩【Purchase Notes】The square hole drill bits need to be used in conjunction with the mortise machine. These drill bits not usable with a hand held drill. If you want to use these drill bits on drill press, you need accessories to connect to a drill press.
  • 🔨【Widely Applications】This square hole drill bit is suitable for wood, including MDF, MDF, particle board, channel wood, pine wood, basswood, etc. Note: It is not suitable for processing metal, glass, plastic, concrete, gypsum board etc.
No. 5
uxcell Square Hole Drill Bit, 1/2" High-Carbon Steel Hollow Chisel Mortise Power Tool for Woodworking
  • 【ADVANTAGE】With long drill core and square chisel, easy to lock the hole on the wood, can reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs.
  • 【SIZE】1/2" (12.7mm) square chisel width, 75mm cutting depth, 205mm total length.
  • 【TIP AND EDGE】The best designed Drilling Point tip and 4 Cutting Corner to enable the fast drilling and penetrating into working pieces of wood very smooth and fast.
  • 【MATERIAL】Made of High-carbon steel, through heat processing, with high hardness (48-50 HRC) drill bits, and sharp-edged square chisel, durable and lasts long.
  • 【OPERATION】Used with mortise and tenon machine with double effect, and electric drill, hammer and other tools is required for punching square hole in wood.
SaleNo. 6
LuckyHigh Square Hole Mortise Chisel Drill Bit Tools 7Pcs Different Sizes 1/4" 5/16" 3/8" 1/2" 9/16" 5/8" 3/4" Square Drill Bit
  • Notice: Mortising chisel drill bit needs to cooperate with square hole drill machine (mortise and tenon) use and can not use with hand-operated electric drill
  • These woodworking morstising chisel bits set fit mortise and drill accessories, mainly used for woodworking aspects in construction, installation, renovation, decoration industry, etc.
  • Fine workmanship: finished with fine polishment, these square drill bits come with no burrs to provide you a smooth drilling experience.Each drill is packed in a single plastic case, easy to maintain.
  • 7 different sizes mortise chisel drill bit 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 1/2 Inch (12.7mm), 9/16 Inch (14mm), 5/8"(16mm), 3/4 Inch (19mm).
  • Material: square hole drill bits are made of high-speed steel, with high hardness up to HRC48 - 50, durable and practical, being heat treatment for a long-term use
No. 7
8MILELAKE 4pcs Square Hole Drill Bits, Woodworking Spiral Mortising Chisel Drill Bit Durable Hole Saw Kits 1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch
  • 【Square Hole Drill Bit】The square hole drill bit set is suitable for all mortising machines and drill press attachments, as well as bench drilling machines. Square holes can be drilled in wood and some composite materials.
  • 【Groove Design】The drill bits for square holes with high performance flute design geometry, combined with U-shaped edge, which can achieve excellent chip extraction and help you better improve drilling efficiency.
  • 【Durable Material】The square hole mortise chisel drill set is made of the high quality steel. After heat treatment, the tool has high hardness, firmness and durability, and the square chisel is sharp and wear-resistant. The sturdy round handle helps you stay more stable during use.
  • 【Various Sizes】The woodworking mortising chisel countersink bit kit includes four different sizes: 1/4 inch (6.4mm), 5/16 inch (8mm), 3/8 inch (9.5mm) and 1/2 inch (12.7mm). These square hole drills of different specifications are commonly used in our daily life.
  • 【 Application】The spiral woodworker hole saw kit needs to be used with mortise machine (not included). If you need to extend the square hole manually, you need to use tools such as electric drill and hammer. During use, please ensure that the board and the drill are at a 90 degree angle.
SaleNo. 8
Wolfride 3 Set of 3pcs Square Head Screwdriver Bits 1/4-Inch Shank Magnetic Square Drive Bits Set| SQ1 SQ2 SQ3, 2-Inch Length
  • High precision, each edge can be accurately locked screws, no damage to the screw and the screwdriver head.
  • With strong magnetic, sucking the screws easily when used it.
  • Size: SQ1, SQ2, SQ3 (3Pcs Each), clearly engraved on the shank for identification easily.
  • 1/4 inch hex shank Square Head Screwdriver Bits, material: S2 steel; Overall Length: 2-Inch/ 50mm.
  • Can be used with electric screwdriver, manual screwdriver, electric drill, group general tools, air drill and other any standard bit holders.
No. 9
Roberston Bits Set, Square Head Screwdriver, Square Screwdriver bits #1#2#3#4, Scrulox Screwdriver, Impact Rated Bit Sets 10 Piece by Milliontronic
  • Taiwan Made S2 Steel
  • Robertson Square Bit #4 ( R4 ) x 2
  • Robertson Square Bit #3 ( R3 ) x 3
  • Robertson Square Bit #1 ( R1 ) x 2
  • Robertson Square Bit #2 ( R2 ) x 3
No. 10
Woodworking Mortising Chisel 3/4 inch Square Hole Power Tool Bit, Sharp and Durable Wood Square Hole Drill Bit
  • ▲ ▲ Only use for the opening square hole or rectangle hole, used on most of mortising machine or mortising attachment & tenon machine. CAN NOT be used on an electric drill.
  • ▲ ▲ The Mortising Chisel consists of two parts,round Core drilling and square drilling ( as picture show ).when installing ,this two parts need to be held tightly by a clamp.
  • ▲ ▲ Once molding sqare hole, speed up construction, Reduce labor intensity ,reduce the construction cost of construction, installation, decoration, decoration and other industries
  • ▲ ▲ The holding diameter is Approx. 19mm / 0.74inch (as picture show), please verify this chisel is suitable for your Mortising Machine.
  • ▲ ▲ Size: 3/4 Inch(19mm), high-speed steel material, high hardness, sharp-edged and durable drill bit .

Last update on 2022-10-03 / Affiliate links / Images from Amazon Product Advertising API

What to Consider When Choosing the Best square drill bit

There are many factors to consider when buying a square drill bit online. You may be tempted to just purchase the first one you find and move on with your life, but it’s important to do some research beforehand. Many people don’t realize how much they need to know about a product before buying it. This is especially true if you’re looking for a square drill bit or other large purchases.

When buying online, it is very important to consider all the factors before making a purchase. This will ensure that you get the best value for your money and that the product is of good quality. You can do a few things to ensure you’re getting a good deal on the square drill bit you want. Here are some things to consider before buying a square drill bit online:

Some questions to consider before buying anything online:

  • Is the product durable?
  • What kind of returns policy does the seller offer?
  • Do they include shipping costs in their refund?
  • How long is the warranty on your purchase?
  • Do they offer a warranty?
  • What happens if something goes wrong with my purchase?
  • What is the process for claiming an item that’s damaged or not as described?
  • You need to consider many factors before buying online, including.

Quality of materials used

The materials used in making a square drill bit can determine its quality. For example, if a company uses high-quality material, then it means that its products will be long-lasting and durable. However, if they use low-quality material, then this could mean that their products may not last as long as expected or even break down easily after some time. Thus, it is important that you check out what type of material is used in making the square drill bit before buying it online.

Brand reputation and quality control

Check the reputation of the brand before buying it. You can do this by reading reviews from other customers who have bought products from that brand. Also, check out whether a company has a good quality control system in place or not. If they do, you can be sure that their square drill bit will be high-quality and long-lasting. If not, then you should look for another brand.

Customer support and warranty

If you are buying a square drill bit online, then it is important that you check out whether the company offers good customer support or not. If they do, you can answer your question quickly and easily. You may also need to return the product if it doesn’t work as expected or is faulty. In such a case, having a good customer support system will make things much easier for you.

You should also check out whether the company offers a warranty or not. This is especially important if you are buying a square drill bit online because it means that you can replace any faulty parts of your product if they break within a certain time period.


The price of any product always matters when choosing what to buy online, especially when comparing different products from different companies at various prices. You want to ensure that you get value for your money every time, so try comparing prices between different companies before making any decision.


The features of a product are also very important when comparing the different brands and models available online. You want to ensure that you buy a square drill bit with all the features you need, such as high-quality materials and excellent performance. You may also want to look at the features available with each product and compare them to see which offers you more value for your money. This way, you can decide what kind of square drill bit is best for your needs.

Customer review

Customer reviews are also a very important consideration when it comes to buying any product, including square drill bit. You want to read reviews from people who have already purchased the product and know what they’re talking about, not just random consumers who haven’t bought anything yet. The best place to find reviews is on Amazon. It’s one of the biggest online retailers in the world, and they have a large community of reviewers who can help you make a more informed decision about what kind of square drill bit to purchase.

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