12piece tapping drill set with 6 SAE and 6 metric sizes in common diameters to cover most projects. Includes a hex adapter for quick, tool size changes and improved workflow. Built for durability and performance: quality, hardness HSS delivers fast cutting and good wear resistance for repeated use. Versatile, materialcompatible design: suitable for drilling and tapping in wood, PVC, plastic, aluminum, copper, and metal sheets. Practical use scenarios: Assemble an aluminum frame by drilling and threading holes for screws. a steel cabinet by creating threaded holes for fasteners. Add threaded inserts in plastic components for secure assemblies. Benefits at a glance: Twostandard sizing (SAE and metric) in one set for broad compatibility Hex adapter enables quick size changes without switching tools HSS construction supports efficient drilling and long life Suitable for a range of common materials and applications This set provides a reliable, straightforward solution for DIY and professional tasks that require threaded holes without sacrificing accuracy or speed.