This square hole drill bit adapter is made of high-quality high manganese steel material, which is sturdy for long-term use The dual support bracket is reliable and practical, suitable for bench drills and hand drills. It is ideal for woodworking, furniture manufacturing, and other related industries The square hole drill bit adapter is easy to use. The precision design of the drill press mortise attachment ensures you can drill the correct mortises and tenons in the fastest way. It is more convenient and faster than a mortise machine This square hole drill fixing bracket is easy to install, no other complicated tools are needed to complete the installation This tool layout simplifies the process of drilling square holes on wooden boards. You can reduce the workload, suitable for both beginners and workers. It fits for construction, woodworking DIY, decoration industries, and materials with lower hardness such as compressed board, plastic, density board, sandalwood, pine, ash, pine, etc This square-hole drill bit adapter is designed to help drill the correct mortises and tenons, which is suitable for bench drills and hand drills. It is made of premium high manganese steel material, which is sturdy. It is efficient and accurate and can be used for a long time. Efficient and Precise: Our square hole drill bit adapter can help hand drill or drill press drill the correct mortises and tenons efficiently and accurately. It has a wide range of applications. Dual Support Drill Fixing Bracket: This dual support square hole drill fixing bracket is a practical tool, which can be used for a long time. It is more convenient than a mortise machine. Product Name: Square Hole Drill Bit Adapter dealing: paint Size: Length 15.5cm/6.1 inches, inner length 11cm/4.33 inches, clip hole 1.9cm/0.75 inches Clamping : 3.8cm/1.50inch-4.5cm/1.77inch Scope of application: Hand drill matching Applicable scenarios: woodworking machinery decoration Colour:As Shown Material:steel Package Contents: 1 x drill press adapter for hand drill Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.