... . Passed GB/T19001 and ISO9001 IntroductionHuzhou Cemented carbide Co., Ltd can manufacture various mining tools such as drill bits, brazing ... etc. They can be applicable for tunneling works, geological prospecting, oilfield development and exploitation, coal mining, architecture industry and so on. ... e-mail.The grades which used more frequently are YG3, YG6, YG8, YG3X, YG6X,YG8X, YT5, YT14, YT15 ... ...