Cushioned Ball Mount will reduce the slams and bangs associated with trailer towing during starting and stopping!Reducing these jolts helps to protect the towing vehicle's driveline, hitch assembly, and trailer contents. When installed, the hitch pin block is locked in a fixed position within the receiver tube. The hitch bar and ball mount slide forward and backward as determined by the towing load, compressing the polypropylene cushions as needed. Besides being compatible with all standard after market 2" square receivers, the Cushion Ball Mount is compatible with these other quality Convert-A-Ball® products: All Convert-A-Ball® Hitch System Products. 5/8" hitch pin sold separately.