Feature●High stock removal,Low price-performance ratio●Self-sharpening effect constantly produces new sharp edges and thus enables a much better grinding performance●Special coat for hand-held machines●Cool cutting●Form-resistant vulcanised fibre backingDescription Threads directly onto your 4-1/2" grinder against the backup pad without fumbling with lock nuts.Zirconia alumina abrasive with self-sharpening effect for machining of tough workpiece surfaces impresses with its aggressive cut and very high stock removal.