Widely used for hole opening of metal plates such as 3MM stainless steel plate , 10MM iron plate and aluminum alloy metal plate Hardened lengthening alloy stainless steel tapper with high hardness YG9X hard alloy with strong wear resistance and stable This tapper can only be used when it is installed on the electric hand drill It has the characteristics of excellent , wear resistance The product is , , cost-effective , smooth cutting , and is not easy to, Manufacturer: Watreketal