Colour: Black Material: nylon + stainless steel Size: 115mm*45mm Packing: Cold-resistant temperature: -45 C Advantages: The structure uses mechanical bearings, long service life, low noise, 100,000 cycles. Specifications: Wheel diameter 45 mm Suitable for: automatic garage door, flap garage door, solid wood garage door, anti-pinch Hand garage door, community garage door, engineering garage door, remote garage door, villa garage door Package including: 4pcs Garage Door Roller<br> About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us<br> During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping<br> Thanks for your cooperation and we"ll make you feel satisfied.