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 / mm2 or less the low-carbon steel, copper, aluminum, magnesium alloy; anti-bonding strength 600 ~ 900N /mm2 the high-carbon steel, alloy steel, bronze, etc Package Included: 5 pcs Titanium screw tap