3-piece HSS step drill bit set: spiral groove peeling drill, cone drill, metal drill, cutting tool set for metal, wood, plastic, etc. 4-12mm / 4-20mm / 4-32mm

General Description This 3-piece step drill bit set is designed for drilling holes of various sizes, from 4 to 32 mm. Its conical, stepped design replaces 19 individual drill bits, allowing for efficient use on a variety of materials such as steel, wood, and plastic. Made from high-quality HSS high-speed steel and coated with titanium, this set ensures increased durability and optimal performance. Technical Specifications Drill Bit Sizes: 4-12 mm, 4-20 mm, 4-32 mm Material: HSS 4241 High-Speed Steel Coating: Titanium Drill Bit Lengths: 7 cm for 4-12 mm and 4-20 mm, 10 cm for 4-32 mm Drilling Steps: 9 steps for 4-12 mm and 4-20 mm, 15 steps for 4-32 mm Applications This drill bit set is ideal for: Cutting holes in steel and sheet metal Drilling in wood and plastic Automatically deburring holes for a smooth finish