The squarehole opening bracket is made of all-aluminum material, which is resistant to wear and tear, has high hardness, long service lifespan, and high durability. The squarehole drill bit is all universal design, suitable for 38-43mm electric drill chucks, with a uniform 19mm clamping diameter, which helps to ensure accurate and smooth drilling. Professional woodworking tools, most of the hand drills can use this bracket, but the rechargeable drills (lithium series) and the table drills are not suitable for this bracket. Precise squarehole drilling tool, which is suitable for making mortise and tenon structures to realize a solid joint. Features: Premium Material: The squarehole opening bracket is made of all-aluminum material, which is resistant to wear and tear, has high hardness, long service lifespan, and high durability. Efficient and Convenient: A professional woodworking tool, the squarehole drill adapter bracket helps open squareholes in seconds, greatly improving woodworking efficiency, and is a useful helper for woodworking. Simple Operation: It is easy to open squareholes with this tool, you can quickly install or remove it by yourself, quick and convenient, and even a beginner can easily get started. Universal Design: The squarehole drill bit is all universal design, suitable for 38-43mm electric drill chucks, with a uniform 19mm clamping diameter, which helps to ensure accurate and smooth drilling. Wide Applications: Professional woodworking tools, most of the hand drills can use this bracket, but the rechargeable drills (lithium series) and the table drills are not suitable for this bracket. Precise squarehole drilling tool, which is suitable for making mortise and tenon structures to realize a solid joint. Specifications: Name: Hole Drill Bit Material: aluminum Item size: 53 * 53 * 150mm 2.09 * 2.09 * 5.91in Package size: 160 * 60 * 60mm 6.30 * 2.36 * 2.36in Package weight: 200g 7.05ounce Packing List: 1 * Hole Drill Bit