With professional and productive factory, HAINAISEN is one of the leading China chisel bit manufacturers. Welcome to wholesale chisel bit from us, we always have cheap products to offer you. chisel bit： the chisel bit is made from grade hard alloy and special steel,generally matched with the light-duty rock drill,to drill the rock hole within diameter of 50mm.it is widely used in metallurgy mine,geological exploration. http://www.pdcoiltool.com