Tap Feature 絲攻功能*Diameter 牙徑:S0.5~M20*Reduce resistance of broken. 降低抗折*Material 材料: Carbide+Stainless. 鎢鋼+不鏽鋼*Enhance precision & precentage of thread.提高精度和螺紋的百分比*Guaranteed 25000 hole /pc for Aluminum alloy on CNC machine. 數控機床上的鋁合金保證25000孔/件*Cost down & lncrease life expectancy. 降低成本與增加壽命