Solid carbide step drill,hss & carbide step drills,hss coated step drill 1 OEM &ODM Service 2 ISO9001 3 ... 100% virgin tungst Solid carbide step drill,hss & carbide step drills,hss coated step drill GradeCompositionGrain Size(um)Density(g/cm3 ... mill, tap , generic tools etcJGK1488120.514.192.53800Suitable for the hole processing and thread processing ,but especially suitable for machining titanium ...