... ,reaming shells,casing shoes,PDC bits,wireline drill rods,casings,core barrels for mining,exploration industries in China. our current product ... list as below:1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non-coring ... , HT, PT drill rods6. BW, NW, HW, PW casing.7. Core barrel and accessories:B, N, H and PQ(Inner & Outer Tube ...