attwood 11215-1 Trailer Boat Heavy-Duty Rubber 8" Shaft Keel Roller, Black Non-marring, durable rubber protects your boat's finish Molded rubber over steel tube with nylon end inserts Extremely tough, designed specifically for heavier boats Inward taper and "V" cut eases handling of larger vessels Attwood develops high value, engineered marine products to make life on the water easier to enjoy