Colour: Black Material: nylon + stainless steel Size: 115mm*45mm Packing: 2 sets of 4 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 RollerAbout 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 usDuring 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 shoppingThanks for your cooperation and we'll make you feel satisfied.