Technical data: Power: 250W Noise level error (dB(A)): 3.0 Sound pressure level error (dB(A)): 3.0 Sound pressure level (Lpa)(dB(A)): 55.0 Sound power level (Lwa)(dB(A)): 68.5 Disc dimensions: 150x20mm Disc mounting hole diameter: 12.7mm Easy disc changes with a wrench. RBG6G1 250W DOUBLE DISC GRINDER Designed for grinding and sharpening the hardest metals and keeping tools and equipment sharp and ready to use Die-cast aluminum base reduces vibration and improves stability ** Illustrative photo