The Swivler eliminates coil bind on the coil-over shock. As the spring is loaded bowing occurs, most assemblies will show evidence of rubbing on the side of the adjuster sleeve. The swivler features a nylon ball socket that pivots on the shock shaft to help prevent binding. Available to fit most common shocks. "WARNING: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm."