1.we can produce the drill rod and bits 2.ISO certificate 3.Market: all of the ... B47K22H, B43K, B43H, BHR73, U47,U765, U84 blast furnace taphole cross drill bits We can supply mining bits with holders, we also can ... , such as B47K17H, B47K19H, B47K22H, B43K, B43H, BHR73, U47, U765, U82, U92, U94, etc We also can produce the ... , Brazil, Canada, Korea, Japan, HongKong, Singapore, etc hollow drill steel rod