DTH Bit, DTH Hammer, Button Bit manufacturer / supplier in China, offering T40 Threaded Rock Drill Rod, 3200mm Long, Optimized for Quarry Blasting and Drilling, Custom Made Extension Drill Rod with R38 Thread, 3500mm for Deep - Foundation Drilling Works, API 3 1/2" If 8m Drill Pipe with Wear - Resistant Coating for Oil and Gas Exploration and so on.