Grinding as close as ¼ inch to the wall, the StoneEdge 1300 is a propane-powered edger for concrete polishing. It delivers 165 pounds of head pressure—three times that of electric edgers—and cuts 300 to 400 linear feet per hour. The grinder provides a rotating left-to-right front head, which helps it work close to obstacles. Powered by a 17-hp propane engine, the grinder has no cords and grinds with four diamond discs. Eagle Solutions. 770-773-3875.