... our dominant products are chisel bits, cross bits, buttons bits, DTH bits with high, medium and low air ... shanks and casing tubes which are fit for hydraulic drilling equipments. Our firm produce ... hammer, seal chamber furnace lines, precision machine tools and so on. We adopt ... Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm,42mm,44mmThread Drill Bits--- ...