... rock drill bits and machines used in mining and construction. We manufacture rock drill bits and machines used in mining and construction scope.Buttong bits:head ... / 40 / 42 / 43 with socket 22, 24, 25 and the taper 12°, 6°, 7°Cross bitshead 32 / 34 / ... / 43 / 44 / 46 with socket 22, 24, 25 and the taper 12°, 6°, 7°Retrac bitshead 51 / 64 / ... T45, T51Coal bitshead 28 / 42 / 44 Rock Drill Bits