Gemtex 24130300, 3" Aluminum Oxide - 36 Grit, Red (25/box)

SMD Type are Soft Metal Discs designed for use on soft metals like bronze, brass and aluminum. These discs disperse their own lubrication as the disc grinds, delaying heat build up of the metal work piece. Lower work surface temperature means melting is delayed, allowing the disc to cut and last longer than regular discs. The protected disc acts as an open coat shedding any buildup of debris.