We select and use high quality steel and tungsten carbide tips via forging,welding and heat treatment to make the products Abundant Technical strength ... of "Quality first,Reputaion first",and sincerely wish to cooperate with friends from domestic and overseas in technical coordination,new ... the following Bits and Holders:U82,U84,U85,U92,U95,S120,S150,U765K,U765HD,C31HD,AM511 etc. Mining tools/C31 ...