CRM" thread insert adopt CERATIZIT raw material , with TIALN ,ALTIN ,TIALSIN coating and no caoting . 1. About USZhongji NC Tools Factory is a manufacturer of NC Turning Toolholders(Turning,Boring, Thread, Grooving , Parting ), Thread & Grooving insert ,Carbide Saws and End Mills.,etc. 2.Mission and AspirationZhongji put "To provide for customers with high-precision, longevous, efficient tools, ...