General description The HSS Metal Step Countersink Drill Bit set includes 4 pieces of high-quality HSS steel drill bits with a titanium coating, designed for drilling holes of various sizes in multiple materials such as steel, wood, brass, plastic, and PVC. The set also includes a centering punch for precise positioning before drilling. Technical specifications Sizes: 4-12mm, 4-20mm, 4-32mm Drill bit lengths: 1*65mm, 1*75mm, 1*100mm Material: High-speed steel (HSS) with titanium coating Compatibility and accessories Compatible with steel, wood, brass, plastic, thin iron plates, aluminum materials, insulation boards, and PVC boards Includes 1 centering punch for accurate positioning Usage The step drill is ideal for home and construction use, allowing for the drilling of holes in a variety of materials. The centering punch helps in positioning and pre-drilling to protect the cone drill.