Feature: 1. Aluminum Material: Crafted from premium aluminum, the square hole opener bracket is wear resistant, highly robust, and has a long service life, ensuring superior durability in woodworking projects. 2. Efficient and Convenient: The square hole drill bit adapter bracket is a professional woodworking tool that can open square holes in seconds, significantly enhancing woodworking efficiency and becoming a reliable ally for woodworkers. 3. Universal Design: The square hole drill guide is designed for compatibility with 38 to 43mm electric drill chucks, with a clamping diameter of 19mm, helping ensure accurate and smoothly drilling. 4. Easy to Use: Opening square holes with this tool is simple and user friendly, allowing for quick installation or removal. Easy and convenient to use, even beginners can easily master it for seamless woodworking projects. 5. Wide Application: Professional woodworking tool, suitable for most hand drills, except for rechargeable drills (lithium series) and table drills. It is an accuracy square hole drilling tool suitable for making mortise and tenon joints for secure connections. Specification: Item Type: Squarehole Drill Bit Adapter Material: Aluminum Size: Approx. 53 x 53 x 150mm / 2.09 x 2.09 x 5.91in Features: Premium Material: The square hole drill guide is made of premium aluminum, wear resistant, high hardness, long service life, and high durability. Efficient and Convenient: A professional woodworking tool, the square hole drill adapter can help open square holes in a few seconds, greatly improving woodworking efficiency, and is a handy tool for woodworkers. Easy to Use: It's easy to open square holes with this tool. You can quickly install or disassemble it yourself, fast and convenient, even beginners can easily get started with it. Universal Design: The square hole drill guide is designed for compatibility with 38 to 43mm electric drill chucks, with a clamping diameter of 19mm, helping ensure accurate and smoothly drilling. Wide Application: Professional woodworking tool, suitable for most hand drills, except for rechargeable drills (lithium series) and table drills. It is an accuracy square hole drilling tool suitable for making mortise and tenon joints for secure connections. . Package List: 1 x Squarehole Drill Bit Adapter