Feature: 1. Versatile Application: The boat trailer roller is designed for larger, heavier boats, providing essential protective support during transportation, launching, centering, and recovery, ensuring all around protection for your vessel. 2. PVC Material: Constructed from PVC, this boat trailer roller is non slip, protects your boat’s finish, exceptionally wearproof, and ensures long lasting usage. 3. Smooth Surface: The roller is extremely tough and will not rusting. The surface of the rollers is flat and smooth and will not rub against the hull of your boat, leaving no marks on your boat. 4. Effective Shock Absorption: This boat trailer roller has great shock absorbing effect, protecting the boat's hull from harsh impacts and friction, providing excellent protection. 5. Size: This boat trailer roller features length of 90mm and an overall length of 145mm and a side roller diameter of 78mm. With a hole diameter of 14.5mm. Specification: Item Type: Boat Trailer Roller Material: PVC Length: Approx. 90mm / 3.54in Overall Length: Approx. 145mm / 5.71in Side Roller Diameter: Approx. 78mm / 3.07in Hole Diameter: Approx. 14.5mm / 0.57in Fitment: Suitable for many types of boat or yacht trailers. Package List: 3 x Boat Trailer Rollers 1 x Bolt