3 Inch 4Inch Boat Trailer Roller Assembly Bow Stop Bell Roller with 1/2 Inch Shaft, 3 Inch Roller fits 3 Inch Bracket, 4 Inch Roller fits 4 Inch Bracket, Polyurethane
Overall dimensions (with bells): 5 inch width x 4 inch roller. Inner roller is 3 inch wide. Attachment bolt is 1/2 inch.
This product is thermoplastic polyurethane elastomer(TPU), is one of polyurethane types.From the process, thermoplastic type used the injection type craft.
Will not rust or will not mark your boat,will not flat spot.
Designed to support the weight of your boat on the trailer,absorbs road shock.
End bells ensure that the boat does not scrape against bolts or roller bracket.