Suitable for sampling in concrete, cement, brick or bituminous pavement, or for drilling in pipeline works. Powerful and high-speed series motor; Fine-machined transmission mechanism and superior laser-welded diamond bit ensurefast and correct penetration of granite, reinforced concrete and bituminous pavement; · Dual insulation, dual protection and water-tight switch ensure safe, normaland fast operation. Technical Specifications: Drilling Range: 15-350mm Rated voltage: 220v Rated input power: 4300W NO-load speed: 350r/min