... Drilling tools and Coal Mining Tools. Main products:Tapered button bits (28mm, 30mm 32mm, 34mm, 36mm, 40mm, 42mm ... , 22mm, 25mm; Shank hex. 19mm, 22mm, 25mm)Integral Drill rods( Chisel Bit integral. Rod 19mm, 22mm; Shank hex ... 102mm,115mm, 127mm.)Down the hole drilling(drill bits, hammers, spare parts, drill tubes)Buttons type :Spherical, BallisticWe have our ... but the price is low. button rock drill bits