Piston Ring Std / Kohler 52 108 09-SPack Size:1Gravely 040790, Kohler 52 108 09, Kohler 52 108 01, Kohler 52 108 09-SJ. Thomas KH-10809, NHC 266-9652, Prime Line 7-03779Gravely KT17, M18, M20, MV16, MV18 and MV20; Kohler KT17, M18, M20, MV16, MV18 and MV20Cylinder Diameter: 3.125 ", Ethanol: Not compatible with greater than 10% ethanol fuel, Not chrome