Replacement Lawnmower Blade for AYP / Sears Mowers 42" Cut 139775 Made to meet or exceed FSP specifications. 21-5/16" Long, 2-1/4" Wide, .150" Thick, 5 Point Star Mounting Hole Made with high carbon steel, heat hardened. Newer mowers need the .150 thick blade to tighten properly, the .134" blades may not work.