... of the bits .2, PDC bit include the TSP bit, natural diamond bit and impregnate bit.3, the number of blade scope is four to twelve, the ... size is 8-1/2”, 9-1/2 ... ”, 6”, 17-1/2”,4, the Rotary speed is form 10 ~300 r/min.We have the stock of the main products, but we also ...