Fits most drill types This square hole drill bit adapter is compatible with both drill presses and handheld drills with chuck diameters from 38 mm to 55 mm, offering versatile use across various tools. Fast installation The adapter installs or removes in about three minutes, helping you save setup time on your projects and stay productive. Heavyduty steel design Crafted from solid steel castings, the adapter is built for durability and longlasting performance in a range of woodworking applications. Precise drilling performance Engineered for accuracy, this adapter enables effective drilling of mortises and tenons and serves as a faster alternative to traditional mortising methods. What you can do with it (use scenarios) Mortiseandtenon joints in furniture making, such as tables, chairs, and cabinets, where square holes are required for strong joinery. Cabinetry and door frame work that demands precise square holes for hinges and inserts. Custom woodworking projects or repairs that require consistent, squarehole drilling without dedicated mortising equipment.