Founded in 2004, China Drilling Geological Equipment Ltd. (CDG) is engaged in developing best diamond tools, equipment and accessories which are mainly used in diamond drilling rigs for prospecting. Our products cover impregnated diamond core bits, surface set diamond bits, PDC core bits, rod shoes & casing shoes, reaming shells, drill rods, core barrels, overshots, water swivels, hoisting plugs, casing cutter assembly, adapter subs, wrenches, recovery tools and foot clamps.