... 3.Suitable for Sigma escalator 4.OEM D(80) Step Chain Roller for Sigma Escalator1. Professional service2. Easily ... Unit, Sprocket(bottom)Steps: Step Tread, Riser, Step Demarcation Line, Driving Roller/Trailing Roller, Step ChainOur main products: Elevator Hanger ... Pulleys, Pressure rollers, Support Rollers, Comb Plates, Step Chains and Safety Brushes. All of our products are suitable or replacement ...