... necessary equipments, like hardness tester, tensile strength tester, electronic balance, all gauges, and calipers. Our quality system already passed ISO9001 approval, ... our quality consistence.Powder metallurgy, low noise, and low costMaterials: iron, copper and bronze, Iron+Bronze optional, can be spherical ... Cylindrical. Sintered spherical bush for motors, fan, jars, blenders and other appliances