... China with ISO9001/SGS/GIS/CE 2.Drilled on concrete ,rock ,ceramic ,glass ,fire-proof material High quallity diamond core ... 1.Diamond drilling machine is a kind of reinforced concrete ,rock ,ceramic ,glass ,fire-proof material on new drilling tools ... ,tunnel of road ,railroad and railroad bridge.3.Technical dataDrilling Range: φ15-405mmRated voltage: 110V/220V/240V~Ratde frequency: 50-60HzRaged ...