Auto Parts: Gears (transmission gears, differential gears, etc.). Leaf spring, spiral spring, diaphragm spring, valve spring, etc. Torsion bar, crankshaft, connecting rod.
Aircraft components: turbine blades, wing frames.
Construction Machinery parts and components: gears, tools, knives.
Gold Type: Forged gold type, steel rolling gold type, die-casting gold type, rubber gold type and so on.