Compatibility and Specifications: This Square Hole Drill Bit Adapter is specifically designed for handheld drills, excluding bench drills and rechargeable hand drills. It measures 15cm in length with a diameter of 53mm and offers a maximum cutting depth of 10mm, ensuring precise and deep drilling for woodworking projects. Construction and Durability: Constructed from high-quality cast aluminium, the square hole drill fixing bracket boasts wear resistance and high hardness. Its robust and design guarantees a long service life, making it an essential tool for both amateur and professional woodworkers. Installation Convenience: The adapter is engineered for easy installation and removal, allowing users to set it up or detach it effortlessly. This feature saves time and enhances the efficiency of your work, making it a user-friendly addition to your woodworking toolkit. Operational Excellence: Designed to facilitate accurate and smooth drilling, this Square Hole Drill Bit Adapter Holder is an indispensable professional woodworking tool. It enhances your drilling accuracy, ensuring that each hole is perfectly square and clean, which is ideal for high- woodworking tasks. Color: As Shown Material: Metal Package Contents: 1 set Square Hole Drill Bit 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.