This 3” heavy wall pulley is designed for garage door extension spring systems and provides durable, reliable cable movement during everyday door operation. Built with a heavy-wall gold-finish construction, each pulley features a 3/8” bore and is rated for up to 200 lbs. at 10,000 cycles on an 8’ garage door. Ideal for replacing worn or damaged pulleys in residential extension spring setups. Sold as a pack of 3. Fasteners are sold separately.