NN-PHT-731 : Sunnen Ultra Fin Hn4.48-6.08(2)
Abrasive impregnated nylon bristles give a finer finish and greater consistency for cylinder bores. Ideal for high-performance rebuilding. Also for rebuilding newer style engines that use low-tension rings. Delivers a superior plateau finish so rings will seal immediately. Reduces break-in time. Allows closer tolerances for improved compression, better oil control, lower emissions.