Manufacturing of metal chains and other metal products; sales of metal chains and other metal products; manufacturing of bearings, gears and transmission parts; sales of bearings, gears and transmission parts; manufacturing of hardware products; manufacturing of gears, gear reduction, and gearboxes; sales of gears, gear reduction, and gearboxes; wholesale of hardware products; metal surface treatment and heat treatment processing; retail of bicycles and spare parts; retail of motorcycles and spare parts; import and export of goods; import and export of technology.