Crusher - WikipediaA crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. . The earliest crushers were hand-held stones, where the weight of the stone provided a boost to muscle power, used against a stone anvil. . In industry, crushers are machines which use a metal surface to break or compress.stone crusher steel,Stone Crushers and Stone Metal Suppliers in Hyderabad, IndiaWe deal in Spares parts of Jaw Crusher, Cone Crusher, Conveyors Belts, Impact Rullers, Tugyal Onis, . more.. Stone Crushers and Stone Metal Suppliers.