5PCS Step Drill Bit Set, 5mm-35mm, Titanium Coated HSS Step Drill Bits for Metal, Wood, Plastic, Aluminum, and PVC Made from high-speed steel (HSS) with titanium coating for enhanced durability and heat resistance. Suitable for drilling into various materials including steel, brass, wood, plastic, thin iron plates, aluminum, insulation boards, and PVC. Ideal for use with bench drills, handheld drills, and rechargeable power drills. The step drill design allows for drilling multiple hole sizes without changing bits, reducing damage to the workpiece. Features a tapered cutting edge for larger and deeper holes, as well as hole enlargement in pre-drilled areas. Dual-flute design ensures efficient chip removal and faster drilling speed, improving overall productivity. Precision CNC-manufactured for consistent quality and performance. Center punch tip made of alloy steel for improved impact resistance, aiding in accurate positioning and preventing bit walking during startup. Automatic deburring effect during drilling creates clean, smooth holes. Durable construction resists breakage compared to traditional twist drills. Suitable for home improvement, general construction, and industrial applications.