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205MM 8 Inch Diamond Drilling Machine 110V 700RPM 3800W Diamond Core Drilling Machine Core Drill Rig Concrete Drilling Machine for Wet Dry Concrete Brick Block Model: BS-205A Maximum drilling: 205MM / 8inch Rated voltage: 110V Rated frequency: 50HZ Input power: 3800W No load speed: 700RPM Diamond drilling machine (also known as concrete drilling machine) is a kind of new tool which drills on the reinforced concrete, masonry, and rock, ceramic and refractory, with no dust operations, high efficiency, smooth wall, Size accurate features Core Drill Rig Applicable to construction, quality inspection, installation areas; such as equipment installation, hydropower, gas installation, civil quality inspection, airport runway, highway, railway, Railway Bridge tunnel and so on