1,M0886Q PDC bits 2,best price 3,certificate by API 4,delivery on ... used for mining pilling, water well drilling or oil well drilling2,Model: various kinds and according to the requirements of customers3,Material: ally steel, tungsten carbide ... quantity of the order16,Advantage: high quality on time delivery and large available quantityContact:Amily Sutel:+0086-0317-3228656mobile:+0086-15028736941