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 and lower emissions. Fits AN or GH series hones. Range: 3.78″ to 4.68″.