Oregon 518245 Mower Blade, 22 Contains adapters for 3/8", 1/2", 5/8", & 11/16" center holes, plus 3/8" & 5/8" center hole blade washers Blade comes with an adaptor kit. It fits most walk behind mowers (excluding Honda, Lawn- Boy and Toro) Resists bending, breaking and fracturing Gator Mulcher feature provides efficiency in normal or abrasive conditions