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 Rroller Material: PVCCenter Bore: Approx. 13mm/0.51inQuantity: 3pcsFitment: Fit for trailer, boat. Package List: 1 x Keel Rroller(3pcs parts)