KEMAI is a professional manufacturer of quality rock tools, such as button bits, Retrac bit, Integral drill steel, Tapered drill rod, Extension rod, Pneumatic rod, DTH hammer and bits, Shank adaptor, Coupling, Rock bolting, which serve in mining, quarry, water well, oil, gas, civil construction and slope stabilization industries. We also serve customized design, production and service according to worldwide clients different condition.