Tormek T-7 Water Cooled Precision Sharpening System, 10 Inch Stone Designed for the Toughest Work Can Run Continuously without Overheating 10-Inch Grindstone Strong 1/8-Inch Steel Housing Industrial single phase, 200 W (input) 115 V, 60 Hz. Continuous duty, Maintenance free. Silent running, 52 dB. 25,000 hour life