Simple to use: The square hole drill bit adapter mortise tool fixing bracket features a straightforward design that allows quick installation or removal, reducing setup time and making mortise work more efficient. Professional grade tool: Engineered for precision drilling, delivering clean, consistent mortises and reliable results that meet the demands of woodworking professionals. Optimized for electric drills: Designed specifically for use with electric drills, ensuring smooth operation, strong compatibility, and dependable performance during each project. Size and compatibility: Fits electric drills with an exposed clamping part width of approximately 20 mm and accommodates bit diameters from 38 mm to 43 mm. Please doublecheck these dimensions before use to ensure a proper fit. Practical use scenarios: Constructing furniture or cabinetry that requires accurate square mortises or hardware mounting points. Installing locks, hinges, brackets, or fittings that demand precise square holes for a reliable fit. Quick mortise setup in workshop workflows for prototyping or rapid hardware installation without retooling.