Piston Ring +.010 / Briggs & Stratton 499997Pack Size:1Briggs & Stratton 391781, Briggs & Stratton 394960, Briggs & Stratton 499997ESF 163-065, Foley/Belsaw 5978228, Foley/PLP 163-065, Foley/PLP 163-066, Green Meadow R953, Laser 94206, Laser L5603, NHC 266-9791, Oregon 36-016, Prime Line 7-03708, Prime Line 7-03552, Rotary 6773Briggs & Stratton 220400-222400, 252400-255700, 28A700-28D700, 280700-286700, 400400, 402400-404700 and 42A700-460700Cylinder Diameter: 3.4475 ", Ethanol: Not compatible with greater than 10% ethanol fuel