... Tools, Downhole Tools, Tricone Drilling tools and Coal Mining Tools. Main products:Tapered button bits (28mm, 30mm ... 25mm; Shank hex. 19mm, 22mm, 25mm)Integral Drill rods( Chisel Bit integral. Rod 19mm, 22mm; Shank hex. 19mm, ... 115mm, 127mm.)Down the hole drilling(drill bits, hammers, spare parts, drill tubes)Buttons type :Spherical, BallisticWe have ... good, but the price is low. ore mining drill bits