• Silicon Carbide is Black in color • The hardest and sharpest manufactured abrasive grain • This is the only coated abrasive that will cut through hard or brittle surfaces such as glass, marble, tile, granite, carbide or hardened finishes • The finer grits are ideally suited for finishing on many surfaces and hardened metals • Available in grits 24 through 600 • These belts come on the RBX cloth backing for durability under all sanding or linishing conditions