China QL50 QL60 QL Series DTH Button Bits Factory ...
QL30 QL40 QL50 QL60 QL80 DTH Button bits. 152mm 155mm 159mm 165mm 172mm 178mm 190mm 203mm QL60 DHD360 SD6M60 dth drill bit. 1.Lower oil,air consumption 2.Medium and high air pressure DTH bits 3.Air holes:2,3 4.Diameter:254,305,311,318,330 . Tungsten Carbide DTH Drill Bits
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