Description:HSS Step Cone TitaniumPlating Drill Bit Hole Cutter, is made from high quality HSS steel with titaniumcoated to reduce friction and heat, which is used to cut thin iron plate,aluminum material, insulation plate, PVC plate and more. Unique step structure makeit possible to open various size of holes.Features:1. Made of high speed steel, hard,wearproof and durable. 2. Handle with titanium coated, reducingfriction and heat.3.Uniquestep structure make it possible to open various size of holes.4.Compared with ordinary twist drill, not easy to break.5.Ideal for cutting holes in a variety of materials including steel,bronze, aluminum and more.Specifications:Material: HSS4241SurfaceTreatment: Titanium Plating Handle Shape: HexColor: YellowBit Type: 4-32mm,4-20mm, 4-12mm, 3-12mm(Optional)Package Includes:1 x Step DrillBit