Quarry and mine customers do not ask about depth first, they ask how many meters per hour. This JK1300 in DTH configuration is built around that question. The DTH setup 25 bar high pressure compressor, sized so the hammer still hits hard at 250-300m 4 inch hammer for 105-165mm blast holes, 6 inch hammer for 165-350mm dewatering holes Button bits for granite, basalt and hard limestone 89mm reinforced pipe, thicker wall, made for hammer shock rather than rotary only In basalt
