Escalator Duplex roller chains & bushing chains A-2 Type Description : 12A-2,16A-2,20A-2,24A-2,28A-2,32A-2 Escalator Duplex roller chains & bushing chains A-2 TypeDescription : 12A-2,16A-2,20A-2,24A-2,28A-2,32A-2 Escalator Duplex roller chains & bushing chains A-2 Type