... Low Air Pressure DTH Bits1.high and low air pressure down-the-hole drill bits 2.Low air pressure holeDia.:65-220mm3.High air ... type:drop center/concave/convex/double gauge/flat5.Our DTH Bit can be suitable for many types of DTH Hammer, such ... , IR, Mach, Demag, SD, Bulroc, Halco Mach, Digger etc.DTH bit is our main product. After mang years search, we have ...