Rock drill The machine is a tool for the secondary blasting in quarry and especailly for rocking 20mm hose in marble and granite, it has characteristic of low weight, reasonable structure, handy use and little air consumption. Specifications Weight 6kg Length 426mm Air pressure 0.4-0.63mpa Air consumption _9.5l/s Air pipe dia 13mm Impact frequency +51hz Drill bit dia 20mm