Yencoly Step Drill Bit 1Pcs Hexagonal Handle Spiral Groove Step Cone Cobalt Drill Bit High Speed Steel Hole Cutter Drill Press Vise Drill Bit S-4-22mm-

Description: Spiral Groove Step Cone Drill Bit is made from high quality high speed steel with titanium coated to reduce friction and heat, which is used to cut thin iron plate, aluminum material, insulation plate, PVC plate and more. Unique step structure make it possible to open various size of holes.   Features: 1. Made of high speed steel, hard, wearproof and durable.  2. Handle with titanium coated, reducing friction and heat. 3. Unique step 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: HSS4241 + cobalt Surface Treatment: Titanium Plating Handle Shape: Hex Handle Diameter: Approx. 6.35mm/0.25in Bit Type: 3-12mm, 4-12mm, 4-20mm, 4-22mm(Optional)   Package Includes: 1 x Spiral Groove Step Drill Bit