... quality and long life time Item No: Crown & pinion (rear) 9901232 0177B with ratio 17-28A: Features1) Material: Steel(20CrMo, 20CrMoTi, 42 ... built between us.Mobile:+86-13657687302Trademanager:cqyongyue Crown & pinion (rear) 9901232 0177B with ratio 17-28