General description The CCYKXA Step Drill Bit is designed for precision drilling in various materials including metal, wood, brass, aluminum, and plastic. Available in three sizes (4-12mm, 4-20mm, 4-32mm), this drill bit features a triangular shank for secure attachment to screwdrivers. Its laser-engraved sizes ensure accurate drilling without wear over time. Technical specifications Sizes: 4-12mm, 4-20mm, 4-32mm Material: HSS steel with titanium coating Usage To enhance the longevity of the drill bit, it is recommended to pour water while drilling. This step drill bit is ideal for drilling or enlarging holes in various materials, including sheet metal, aluminum, insulation board, PVC board, and wood with a thickness of up to 5mm.