The DURA-BILT Commercial-Grade 3 in. Garage Door Pulley is a replacement pulley for old, noisy or broken garage door pulleys on sectional, track-style garage doors. The pulley can be installed in a stationary position on door frame or attached to the spring itself. A 9-ball steel bearing results in a quieter and smoother opening and closing of your garage door. This product is perfect for DIY garage door repair and maintenance.