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Diamond drill,also called concrete drill is a new type of tool which can drill on RC,brick and stone,rock,china and fireproof materials.It is hold such characteristics as working high efficiency,smooth wall of hole and accurate size.It is available in many fields of construction,quality-checking,airfield runway,tunnel of road,railroad and railroad bridge. Product Name£ºSCY-2020/3EBS Max brick diameter:-7.8"(-200MM) Max concrete diameter:-6.2"(-160MM) Rated voltage:110V Rated frequency:50-60Hz Rated input power:2100W No-load speed: 100-800/1790/3650 r/min if you want other Rated voltage for 220V or 240V, or other kind plug for EP,CN,GB,US, or other kind spindle:1-1/4"-3 UNC, 1-1/4"-7UNC,Beijing thread M22*2.5,1-1/4"-7UNC&1/2"BSP,1/2"BSP female,please leave message to us. we provide special order.