Description: 1\/4 Inch Hex Shank HSS Step Cone Drill Bit 4-12mm Titanium Coated Hole Cutter Specification: Material: HSS \/ High Speed Steel Surface Treatment: Titanium Coated Shank Size: 1\/4" Hex Shank Length: Approx. 67mm 4-12mm 5 Step (4mm, 6mm, 8mm, 10mm, 12mm) Scop : thin iron plate,aluminum,insulation panels,PVC panels 4mm thickness within the timber. Quantity:1pc Features : No need for a pilot hole. Titanium coated to reduce friction and run cooler. It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc Ideal For DIY, Home and General Building\/Engineering Using. Package Included: 1 x HSS Step Drill Bit More Details: