General Description: The garage door roller is designed with a lubrication groove that effectively disperses lubrication over a long period. It offers a long lifespan and operates in low temperatures, down to -45°C. Thanks to its precision ball bearings, it reduces garage noise, and its nylon rollers are much quieter than traditional garage doors. Technical Specifications: Dimensions: 11.5 x 4.5 cm (L x Diameter) Weight: 534 g Quantity: 4 garage door rollers Compatibility and Accessories: Compatible with the following garage door types: Automatic garage door, Arched garage door, Solid wood garage door, Pinch protection garage door, Cellular garage door, Engineered garage door, Remote-controlled garage door, Villa garage door Installation: For optimal installation, follow the instructions included with the product. Ensure that the rollers are correctly aligned and secured to guarantee smooth door operation. These rollers are designed to facilitate the opening and closing of garage doors while reducing noise and wear. They should be regularly inspected and lubricated to ensure continuous operation.