Solid carbide step drill,hss & carbide step drills,hss coated step drill 1 OEM &ODM Service 2 ISO9001 ... 100% virgin tungst Solid carbide step drill,hss & carbide step drills,hss coated step drill GradeCompositionGrain Size(um)Density(g/cm3 ... titanium alloy and other materials .It is usually made into twist drill, end mill, tap , generic tools etcJGK1488120.514.192.53800Suitable ...