FITS MOST DRILL TYPES This square hole drill bit adapter works with both drill presses and handheld drills bearing chuck diameters from 38 mm to 55 mm, making it suitable for square-hole mortising tasks in woodworking. FAST INSTALLATION PROCESS User-friendly design enables setup or removal in about three minutes, saving time on project changes and reworks. HEAVY-DUTY STEEL DESIGN Built from solid steel castings for durability and long-lasting performance across a range of woodworking applications. PRECISE DRILLING PERFORMANCE Engineered for accuracy in mortises and tenons, providing a faster, reliable alternative to traditional mortising methods. Use scenarios - Create precise mortises for mortise-and-tenon joints in furniture frames such as tables, chairs, and cabinets. - Install square-hole mortises for hinges or hardware in doors, cabinets, and framing work. - Use in hobby or shop projects requiring accurate square joints to improve fit and strength.