Bulk Packaged 1/8 inch x 1/4 inch Silicon Carbide Cylinder Grinding Stone. Silicon Carbide Stones are used for non ferrous metals, like aluminum and brass, as well as very hard metals like carbide. Can also be used on glass, porcelain, ceramic, stones and gemstones. Compare to Dremel 83702. For use with Dremel Rotary Tools. 1/8 inch shank.