ITEM NAME:3-12mm Coated Stepped Drill Bits Hex Handle Drill Bit Metal Drilling Power T Gw.1 x Hexagonal Stepped Drill. Suitable for : use in the hardness of 25 Â ° below the workpiece, such as carbon steel, thin iron plate, insulation board, PVC board, wood, sheet thickness below 5MM. 3-12mm: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12mm.
