... Sigma escalator 4.OEM D(80) Step Chain Roller for Sigma Escalator1. Professional service2. Easily to order3 ... Main Track, Trailing Track, Moving Handrail Drive Unit, Sprocket(bottom)Steps: Step Tread, Riser, Step Demarcation Line, Driving Roller/Trailing Roller, ... Elevator Hanger Rollers, Door Lock Rollers, Polyurethane Rollers, Roller Guide Shoes, High-speed Rollers. We manufacture polyurethane ...