... .Size:D(80) 2.Step roller, chain roller 3.Suitable for Sigma escalator 4.OEM D(80) Step Chain Roller for Sigma Escalator1. Professional service2 ... , Decking, Speed Sensor, HR Roller, Newell Wheels, Stantion, Skirts, Combplates, Steps, Demarcation, Roller Guides, Chain Guides, Castings, Drive Chain, Drive Gear, Bull Gear, Turnaround ...