Woodworking Square Hole Drill Bits

Square Hole Bits for Your Next Woodworking Project

Prepare square mortises for furniture, cabinetry, and other woodworking projects with six bit sizes in one set. Choose the bits-only option or the set with a drill bit holder to suit your existing equipment.

Choose Your Set

6-Piece Bit Set — Bits Only
Includes six square hole bits: 6.4mm, 8mm, 9.5mm, 12.7mm, 14mm, and 16mm. Choose this option if you already have a compatible mortising setup. Drill bit holder not included.

6-Piece Bit Set + Holder
Includes the same six square hole bits plus one drill bit holder. Check the holder and bit dimensions against your equipment before choosing this option.

Neither package includes a drill press or powered machine. Equipment and accessories shown in demonstrations are not included unless listed in your selected package.

Check Compatibility Before Ordering

These bits require a compatible mortising setup. Do not assume they can be fitted directly to an ordinary handheld drill or drill press. The holder included in the upgraded set does not guarantee compatibility with every machine. Check mounting dimensions and your equipment manufacturer's requirements before ordering.

Square Mortises for Woodworking

Use the appropriate bit size and a compatible setup to prepare mortises for your joinery projects. Cutting results depend on the wood, equipment, setup, and bit condition; test on scrap material before working on your finished project.

A Closer Look at the Cutting Design

Review the cutting-end details shown below. Correct installation, alignment, and feed technique are important for the finished result. Additional fitting or cleanup may be needed for your project.

Tool Care

Inspect the cutting edges before use and follow the maintenance instructions supplied with your equipment. Clean and dry the bits after use and store them securely.

Match the Bit to Your Setup

Check bit dimensions and mounting requirements against your machine before installation. If you are unsure, contact us with your machine model and mounting measurements before purchasing.

Chip Clearance

Follow your equipment manufacturer's guidance for chip removal and feed rate. Stop the machine before clearing accumulated material or making adjustments.

Six Sizes in Both Sets

Both options include 6.4mm, 8mm, 9.5mm, 12.7mm, 14mm, and 16mm square hole bits. Select the size that matches your project and your equipment's operating limits.

For Mortise-and-Tenon Projects

Plan joints for furniture, cabinet components, and other woodworking projects. Check the fit between each mortise and tenon before final assembly.

Demonstration Equipment Is Not Included

The images show example setups, not a promise of universal compatibility. Neither package includes the powered machine shown. Only the 6-Piece Bit Set + Holder option includes the drill bit holder.

What's Included

6-Piece Bit Set — Bits Only
6 square hole bits: 6.4mm, 8mm, 9.5mm, 12.7mm, 14mm, and 16mm.
Drill bit holder not included.

6-Piece Bit Set + Holder
6 square hole bits: 6.4mm, 8mm, 9.5mm, 12.7mm, 14mm, and 16mm.
1 drill bit holder.

Not included in either package: Drill press, powered machine, workpiece, clamps, or other demonstration accessories not listed above.

Before use: Follow your equipment manufacturer's setup and safety instructions, secure the workpiece, and check tool installation.