Broad compatibility and purpose - Professional woodworking tool designed for most hand drills, excluding rechargeable lithium-series drills and drill presses. It is a precision square-hole drilling tool for creating mortise and tenon joints to achieve secure connections. Efficient and convenient - The square-hole drill bit adapter holder is a professional woodworking tool that can open square holes in seconds, significantly improving woodworking efficiency and becoming a reliable ally for woodworkers. Durable aluminum construction - Made from premium aluminum, the square-hole opener/holder is rugged, sturdy, and long-lasting to ensure durability across woodworking projects. User friendly and easy to operate - Opening square holes with this tool is simple and user-friendly, enabling faster installation or removal. Easy and convenient to use, beginners can master it for seamless woodworking projects. Use scenarios - Mortise and tenon joinery for furniture construction such as tables, chairs, and cabinets. - Quick mortising in cabinetry, frames, and other wooden structures where precise square holes are required. - Repairs or retrofits that involve adding or replacing square holes in wooden components.