... Roller for Sigma Escalator 1.Size:D(80) 2.Step roller, chain roller 3.Suitable for Sigma escalator ... Unit, Sprocket(bottom)Steps: Step Tread, Riser, Step Demarcation Line, Driving Roller/Trailing Roller, Step ChainOur main products: Elevator Hanger ... rollers and related products for automatic escalators, including Step Rollers, Step Chain Rollers, Handrail Driving Pulleys, Pressure rollers, ...