Grinding Wheel: 9" Fast Grind Motor: 3/4 H.P. 1725 RPM Frame: 11 Gauge Formed Steel Width: 20" Height: 13" (13.5" with Grit Collector) The RBG 712 made grinding lawnmower blades simpler and safer than ever before. Now the new RBG 934 brings more power and more speed to your shop while providing all the benefits of the RBG 712. Featuring a 3/4 H.P., continuous duty, fan-cooled motor the RBG 934 is ready to meet your commercial needs, and with a larger 9” disc wheel your sharpening time will decrease even more than before. Designed to sharpen any length of standard or reverse rotation straight blades this grinder will give you a factory flat edge using our preset blade guide to maintain the proper angle for best cut and edge life.