1.Long-life, 2.High penetrability. 3.Can match ... well, and our dominant products are chisel bits, cross bits, buttons bits, DTH bits with high, medium and low air pressure, ... of the products.Tapered Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm,42mm ... ,44mmThread Drill Bits---Diameter: 51mm to 127mmThread Type---R22,R25,R28 ...