Feature 1Premium Material: Keel rolleris made of premium PVC material, wear resistant, non marring, protects your boat's finish, sturdy and durable. 2Function: Bow roller efficiently helps center and guide the keel of your boat on to the trailer for level and safe trailering, has a long service time. 3Unique Design: Bow stop roller has embedded grooves, to automatically center the boat while the boat rolls forward, convenient and practical. 4Excellent Performance: Professional manufacturing, exquisite workmanship, waterproof, stable performance and high reliability. 5Simple Installation: The installation is simple, direct replacement the old one, no complicated operation is required, save your time and energy.Item Type: KeelRrollerMaterial: PVCCenter Bore: Approx. 13mm/0.51inQuantity: 3pcsFitment: Fit for trailer, boat .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x KeelRroller(3pcs parts)