These 3/4" diameter, extra-coarse Garnet discs are manufactured with the grit resin-bonded onto one side of thin yet stiff paper-backed discs. (Garnet is a natural mineral which is slightly less aggressive than Aluminum oxide. Recommended for general use and with acrylics and gold.) These stiff paper backed discs are long-lasting and hold their shape well. Ideal for maintaining flat and angled geometry. Since they are manufactured with the Moore Snap-on brass center, they need to be used with a Snap-on mandrel (sold separately). Max. operating speed: 30,000rpm. Sold in box of 200 discs.