Enhance your boat trailering experience with this QDYZPP 4-inch width black molded rubber spool roller. Designed specifically for boat trailers, this heavy-duty roller features a 5/8-inch center hole for easy mounting and secure installation. The durable molded rubber construction provides excellent support and protection for your boat during loading, unloading, and transport. The spool design allows for smooth boat movement while preventing damage to the hull. At 4 inches wide, this roller offers ample surface area for stable contact with your vessel. Perfect for replacing worn trailer rollers or upgrading your existing setup, this black rubber roller delivers reliable performance for your boating needs. The robust construction is built to withstand repeated use and various weather conditions, making it a practical choice for boat owners who demand dependable trailer components. Made of molded rubber Black color Plastic sleeve helps keep roller moving freely for easier boat loading 3-7/8" overall length 2-7/8" diameter on ends 5/8" mounting hole diameter