Resilient, shock-absorbent, non-marking Super Rollers are made from high-quality polyurethane to protect your investment. They spin freely to reduce drag while launching or retrieving your boat and remain uneffected by oil, gas or salt. Should last the lifetime of your trailer. Made in the U.S.A.TypesV-Bow StopsBow StopsBow Rollers - Outside Dia - - Hole Dia - - Fits Bracket - - Vendor Part # - V-Bow Stop V-Bow Stop Mini Bow Stop Bow Stop Bow Stop Bow Roller Bow Roller --- --- 4-1/4" 5-1/4" 5-1/4" 3" 3-1/4" 1/2" 1/2" 1/2" 1/2" 1/2" 1/2" 1/2" 3" 4" 3" 3" 4" 3" 4" RP-3 RP-404 ULT-435 ULT-3 ULT-4 RP-335 RP-444