Square Hole Drill Bit Adapter Efficient Woodworking Tool for Mortise and Tenon Joints Aluminum Alloy 38 to 43mm Drill Chucks Spec: Item Type: Squarehole Drill Bit Adapter Material: Aluminum Size: Approx. 53 x 53 x 150mm / 2.09 x 2.09 x 5.91in Package List: 1 x Squarehole Drill Bit Adapter 1. Efficient Square Hole Drilling: Open square holes in seconds with this professional woodworking tool, significantly enhancing efficiency and accuracy for woodworkers. 2. Compatibility and Precision: Designed for 38 to 43mm electric drill chucks, this square hole drill ensures accurate and smooth drilling with its 19mm clamping diameter. 3. Versatile and Accurate: Suitable for most hand drills, except for lithium series and table drills, this square hole drill bit adapter is suitable for creating mortise and tenon joints for secure connections. 4. Simple and User Friendly: Easily install or remove this tool for quick, making it convenient for beginners to use and master for seamless woodworking projects. 5. Premium Aluminum Construction: Crafted from aluminum, this square hole drill bit adapter is wear and durability, ensuring superior longevity in woodworking projects.