V-Belt | Sierra 18-15480 V-Belt 48 inches effective length 29/64 inches top width High strength synthetic cords resist shockload failure Compression part is a special rubber compound that assures smooth and even transfer of load forces to the cords Rubber edges maintain smooth, positive, no-slip contact with pulley grooves for reliable energy transfer Clogs are molded to precise tolerances to improve flexibility and maintain cord support Replaces Mercruiser 57-48122Q