General description Used as electric door upper wheel, panning door nylon clamp wheel, iron gate wheel, electric door guide wheel, track wheel, and pulley. This product features two 6201 bearings inserted, making it a great replacement for damaged or old wheels. Technical specifications Size: 48x50 mm Material: Nylon Color: Yellow Measurement allowed error: +/- 1-3 cm Package Contents 2 x Guiding Wheels Other information