Features:100% Brand New and High Quantity.High hardness， fast cutting， wear high temperature. Spiral groove is conducive to remove crumbs， not easily broken tap.Spiral Tap the crumbs into a spiral up chip evacuation， it is more suitable for the processing of blind holes and sticky materials processing. Applicable Workpiece: tensile strength 750N / mm 2 or less the low-carbon steel， copper， aluminum， magnesium alloy; anti-bonding strength 600 ~ 900N / mm 2 the high-carbon steel， alloy steel， bronze， etc. Specifications:Material: HSS Surface treatment: TiType Size:M3: 3mm*0.5mm M4: 4mm*0.7mm M5: 5mm*0.8mm M6: 6mm*1mm M8: 8mm*1.25 mm Package Included:1x Titanium screw tap