... every working procedure.Use high quality test equipment as hardometer,image survey meter,etc.Also run tests like metallographic analysis. 4 ... carefully. DetailsMaterial:copper, beryllium copper, brass, bronze, OFHC, stainless steel, free-cutting steel, POM,aluminum, PTFE, PEEK,etc.Chamfer Degree:0 ... the balance after goods is ready.Or accordingto contract. Stamping service