Woodworking Square Hole Drill British Lengthened Opening Square Hole Drill Head 6.35mm to 12.7mm

This square hole drill head is designed for woodworkers who need to create precise square holes for mortise and tenon joinery without investing in a dedicated mortising machine. The British lengthened opening provides extended reach, making it suitable for deeper workpieces. With four available side length options—6.35mm, 7.94mm, 9.5mm, and 12.7mm—you can select the right size for your project. The drill head features a 19mm clamping diameter for secure fitting in standard drill chucks.

Features and Construction

Constructed from steel, this drill head is built for woodworking tasks that require accuracy and repeatability. The diamond filter section extends above 210mm, allowing access to deeper cavities without sacrificing stability.

Material and Build

The drill head is made from steel, offering the rigidity needed for cutting square holes in timber. The clamping section is machined to a 19mm cylindrical diameter to fit most drill press chucks securely.

Size and Practical Fit

The four available sizes—6.35mm, 7.94mm, 9.5mm, and 12.7mm—cover common mortise widths. Each size refers to the side length of the square hole produced. The clamping diameter remains 19mm across all options, so you can switch sizes without changing the chuck.

Uses and Placement

This drill head is intended for use with a drill press or other stable drilling equipment to produce square holes in wood. It is particularly suited for joinery work such as mortise and tenon joints.

Event or Professional Use

Professional woodworkers and joiners can use this tool to create accurate mortises for furniture, doors, and frames. The extended reach of the diamond filter section supports deeper holes often required in timber framing.

Everyday Home Use

DIY enthusiasts tackling woodworking projects at home will find this drill head useful for repair work, shelving, and small furniture builds. The selection of sizes accommodates various project scales.

Benefits and Buying Value

This drill head offers a practical alternative to dedicated mortising machines, reducing cost and workshop space requirements. Its simple design and compatibility with standard drill presses make it accessible for many users.

Reuse and Low Maintenance

With proper care—cleaning after use and light oiling—the steel construction can serve many projects. There are no moving parts, so maintenance is minimal.

Why Choose This Product

Choosing this drill head means you can produce square holes in wood without specialist machinery. The range of sizes and British lengthened opening provides flexibility for different timber thicknesses and joint sizes.