1. Iron powder metallurgy spur gear for tools and appliances 2. High quality, low price 3. customizing ... hardness tester, tensile strength tester, electronic balance, all gauges, and calipers. Our quality system already passed ISO9001 approval, which ensures ... consistence. Powder metallurgy sintered bush and motor bushing, low noise, and low costMaterials: iron, copper and bronze, Cu+Fe optional, can ...