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