B1RBG712 ROTARY BLADE GRINDEROne New RBG 712 Rotary Blade Grinder Lawn Mower Blade Sharpener The RBG 712 Rotary Blade Grinder (also sold as the Wall Enterprises RBG712) is a wall mount or bench mount mower blade sharpener designed for commercial landscapers and professional shops. It restores rotary mower blades to a factory flat cutting edge using a preset 30 degree blade guide and a 7 inch fast grind disc wheel, eliminating the need for traditional grinding wheel dressing. The