Feature:1. Premium Material: Keel rolleris made of premium PVC material, wear resistant, non marring, protects your boat's finish, sturdy and durable.2. Function: 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.3. Unique Design: Bow stop roller has embedded grooves, to automatically center the boat while the boat rolls forward, convenient and practical.4. Excellent Performance: Professional manufacturing, exquisite workmanship, waterproof, stable performance and high reliability.5. Simple Installation: The installation is simple, direct replacement the old one, no complicated operation is required, save your time and energy.Specification:Item Type: Keel RrollerMaterial: PVCCenter Bore: Approx. 13mm/0.51inQuantity: 3pcsFitment: Fit for trailer, boat Package List:1 xKeel Rroller(3pcs parts)