Feature:1. Quick Cutting: Internal, middle and external 3 blade design ensures easy hole drilling with high efficiency.2. Reliable Work: Smooth chip removal will prevent jamming and breaking, will angle design reduces friction.3. Fit for Metal: Suitable for cutting thick iron plate and other material, this hole drill bit is very useful.4. Good Material: Adopting high speed steel material, not easy to deform and has excellent durability as well.5. Simple Using: With a storage box, a hex wrench and a spring, the carrying is as easy as the installation.Specification:Item Type: Hole SawMaterial: High Speed SteelCutting Diameter: Approx. 16mm / 0.63in.Package List:1 x Hole Saw1 x Hex Wrench1 x Storage Box1 x Spring