Because of the design of combined hammer, you can just replace the section of worn hammer head. You can reduce the cost by over 30%. In addition, the vice hammer is added to effectively prevent damaging for the board by the worn main hammer. It is widely used for artificial sand, in metal and non-metal ores, cement, refractory material, bauxite, silicon carbide, glass material, building material. The finished sand has even particle size, high compressive strength, and high-purity.(url:http://www.mouldingparts.com/Crusher-parts/Sand-makerSand-making-machine-spare-parts-Combined-hammer.html)