1. Iron powder metallurgy spur gear for tools and appliances 2. High quality, low price 3. customizing sizes ... bushings, structural parts etc. Our testing lab have all necessary equipments, like hardness tester, tensile strength tester, electronic balance, ... consistence. Powder metallurgy sintered bush and motor bushing, low noise, and low costMaterials: iron, copper and bronze, Cu+Fe optional, can ...