Spiral Tap the crumbs into a spiral up chip evacuation, it is more suitable for the processing of blind holes High hardness, fast cutting, wear high temperature. Spiral groove is conducive to remove crumbs, not easily broken tap. 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. size: M3: 3mm*0.5mm : 4mm*0.7mm M5: 5mm*0.8mm M6: 6mm*1mm M8: 8mm*1.25 mm Material:Metal colour:Gold + Silver Package Contents: 5 * Titanium screw tap Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.