Features： 1、High Durability: Made of thermoplastic polyurethane elastomer(PU), this bow roller is designed for durability and reliability, not susceptible to aging and cracking. 2、Powerful Function: This practical roller will not rust or mark your boat, providing protection and cushioning to the hull when secured against bow stop brackets. 3、Shock Absorbing Design: Supports the weight of your boat on the trailer, absorbs road shock, and prevents scraping against bolts or roller bracket. 4、For Boat Centering: The bow bell assemblies prevents bow to bowstand contact, helping to center the boat and improve stability during transport, providing enough convenience. 5、Versatile Usage: Suitable for trailers, boats, and yachts with a 4 inch bow roller with 1/2 inch shaft, the 7.25 inch full length roller provide you with a reliable use. Specification： Item Type: Boat Trailer Roller? Center Bow Size: 4in? Shaft Size: 1/2in Total Length: 7.25in Application: For Boat, Trailer,?Yachts Package List： 1 x Trailer Roller