it is used for gearbox , it`s quality is very good . High technology, HOWO, BENZ, VOLVO truck spare parts. TS/16949, ISO9001:2002 certificate. Automobile transmission Gear Series A: Features1) Material: Steel(20CrMo, 20CrMoTi, 42#,45#,ZF7B...)2) Processing:Forging, Maching(Shaping, Hobbing), Heat Treatment, Annealing, Quenching... B: Packing1) Inner packing: Waterproof kraft paper packing2) Outer ...