Escalator implex roller chains & bushing chains A-1 Type Description : 12A-1,16A-1,20A-1,24A-1,28A-1,32A-1 Escalator implex roller chains & bushing chains A-1 TypeDescription : 12A-1,16A-1,20A-1,24A-1,28A-1,32A-1 Escalator implex roller chains & bushing chains A-1 Type