The Aztec UltraEdge professional concrete grinder and polisher’s aggressive planetary action is ultra high speed and gear driven, and it eliminates cords and generators. The UltraEdge is ideal for reaching 3” under any 5¼” high shelving and grinding and polishing within ¼” of walls. All of Aztec’s propane machines are powered by the CE, EPA, CARB, LEED and GS-42 certified PurePowerLPG 600 Series engine, as part of the WorkSmartTM UltraGrind 3-Piece Cordless Grinding, Polishing, and Edging System. Starter and specialty packages are available for chemicals, diamonds, propane vacuums and hand grinders.