... : Ø15-255MMRATED VOLTAGE: 220VRATED FREQUENCY: 50-60HZINPUT POWER: 4250WNO-LOAD SPEED: 0-580R/MINDiamond drill, also called concrete drill is a ... materials. It is hold such characteristics as working without dust, high efficiency, smooth wall of hole and accurate size. It is ... -checking, airfield runway, tunnel of road, railroad and railroad bridge MULTI-FUNCTIONAL DIAMOND DRILLING MACHINE