With Blade Grinder/Sharpener RBG 712 sharpening lawnmower blades has never been easier. You can restore your blades to a factory flat edge using the preset blade guide to maintain the proper angle for the best cut and edge life. Allows you to grind any length of cutting edge required for both standard (right-hand) and reverse (left-hand) blades. 32-11706, RBG712, R.B.G.712. Optional RBG940 Grit Collector sold separately. For replacement Fast Grind Disc grinding wheel, use RBG780.