Dremel 85602 Silicon Carbide Grinding Stone is designed to grind and etch stone, glass, ceramics, porcelain and non-ferrous metals. Always remember to have a spare battery pack charged up so you don't have to quit working to recharge your battery and keep your cordless rotary tool charged up and ready to go. Ideal for sharpening, deburring and general purpose grinding on harder materials including stone, glass, ceramic, porcelain, gemstones and non-ferrous metals. Specially designed for working with conic and flat surfaces.