Feature : 1. Hand tap drill hex shank HSS screw spiral point thread metric plug drill bits 2. Back tapered beyond tap to prevent thread damage from over-drilling 3. Suitable for soft metal tapping, such as aluminum plate, thickness of less than 3--4mm 4. Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency Item Describe: 1. 100% Brand New and High Quality 2. Type : Hexagon Handle HSS Tap Drill Bit 3. Material: HSS 4. Material: HSS Shank: 1/4 "(6.35mm) hex shank Diameter Size : M3x0.5: Total length: 55mm, Spiral length: 24mm, drill diameter: 2.5mm M4x0.7: Total length: 54mm, Spiral length: 24mm, drill diameter: 3.3mm M5x0.8: Total length: 58mm, Spiral length: 28mm, drill diameter: 4.2mm M6x1: Total length: 58mm, Spiral length: 28mm, drill diameter: 5.0mm M8x1.25: Total length: 59mm, Spiral length: 18mm, drill diameter: 6.8mm M10x1.5: Total length: 59mm, Spiral length: 20mm, drill diameter:8.5mm Function : 1. Square handle: 6.35mm 2. Metric : M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 3. Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc Package included: 6pcs * Hexagon Handle HSS Tap Drill Bit ( M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 )