Fast-working, but absolutely non-embedding, petroleum, abrasive paste for honing close-fitting parts to an ultra-smooth, friction-free fit. A natural substance, Garnet can be safely used on cast iron, brass, bronze or softer steels without embedding or galling. SPECS: Garnet, oil-base paste. 4 oz. (113 g). GK-5 = 600 grit. GK-7 = 800 grit, GK-10 = 5 microns.