_x005F_x000D_ 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. _x005F_x000D_ _x005F_x000D_ Features: _x005F_x000D_ 1. Made of high speed steel, hard, wearproof and durable. _x005F_x000D_ 2. Handle with titanium coated, reducing friction and heat. _x005F_x000D_ 3. Unique step structure make it possible to open various size of holes. _x005F_x000D_ 4. Compared with ordinary twist drill, not easy to break. _x005F_x000D_ 5. Ideal for cutting holes in a variety of materials including steel, bronze, aluminum and more. _x005F_x000D_ _x005F_x000D_ Specifications: _x005F_x000D_ Material: HSS4241 + cobalt _x005F_x000D_ Surface Treatment: Titanium Plating _x005F_x000D_ Handle Shape: Hex _x005F_x000D_ Handle Diameter: Approx. 6.35mm/0.25in _x005F_x000D_ Bit Type: 3-12mm, 4-12mm, 4-20mm, 4-22mm(Optional) _x005F_x000D_ _x005F_x000D_ Package Includes: _x005F_x000D_ 1 x Spiral Groove Step Drill Bit