[Function] Upgrade your garage door with this electric roller door pulley, designed to provide smooth and efficient operation for easy entry and exit. [Bearings] This pulley is equipped with 6200ZZ bearings that improve performance, reduce friction and extend the life of the pulley system. [Material] This pulley is made of metal and nylon materials, which improves durability and service life, and meets the needs of daily use. [Size] This pulley is 46mm in diameter and 120mm in length, designed to fit most standard garage doors, available as a replacement or upgrade. [Package] The package includes 4pcs electric roller door pulleys, perfect for replacing old, worn, quiet or damaged rollers., Manufacturer: Be In Your Mind