... certificate Powder metallurgy of iron and steel products for hardware tools Features: 1High density and good strength2Good abrasion resistance ... GearsGears, Sprockets, Helical Gears, Bevel gears, Double Gears, Spur gear, Curved gear, Rack gear, Circular gear, Driving & driven gear ... parts, shock absorber parts, synchromesh gear hub, pressure side plate, striking fork, hydraulic valve pushrod seat, oil ...