Color: Amber Size: 5" X 3" This V Shape boat trailer roller is made of polyvinyl chloride (PVC), which is better than rubber, does not wear out and is resistant to corrosion Overall dimension (with bells) is 5 inch long x 4.1 inch diameter, inner roller is 2.8 inch long x 3 inch diameter, attachment bolt is 0.5 inch diameter This bow stop bell roller can guide the keel precisely, reduce friction and make it easier to launch and load the boat The bells on the end ensure that the bolts or brackets won't scrape or mark the boat This assembly includes 1 pc inner roller, 2 pcs bells and 1 pc stainless steel bolt with washers. It is easy to install and have universal fit.