This Shoreline Marine Self Centering Roller allows your boat to roll smoothly on the trailer. It spins freely to reduce drag while launching your boat and is unaffected by oil, gas or salt.

Shoreline Marine Self-Centering Boat Trailer Roller, 12 in:

• Self-centering roller allows boat to roll smoothly on the trailer.
• Spins freely to reduce drag.
• Embedded grooves to automatically center boat while rolling forward or back.
• Made of long lasting, non marking polyurethane.
• Unaffected by oil, gas or salt.
• 5/8″ diameter shaft x 12″ length.