【Part Number】Fit for 84005221/ 2105200317A/ 2105200317，Before placing an order, please confirm that this is the blade you need. The simplest inspection method is to remove the old blade and find the part number printed on it. 【Compatible With】The lawn mower blades are compatible with the Hyper Tough 20 inch walking lawn mower MNA152701, Murray 21 inch walking lawn mower MNA 152901, MNA 152903, and Black Max 21 inch two in one gas propelled lawn mower MNA152905. 【Easy Installation】After removing the blades, remove dirt and grass from the blade installation area. Then replace the old blades with our lawn mower blades. Note: When replacing the blade, make sure the lawn mower is turned off. 【Product specifications】21 inch long, Width: 2 1/4 inches.easy Installation. 2 Pack Blades 【High Quality】84005221 blades are made of durable steel and have strength and resistance to bending or fracture under normal usage conditions.The strong and durable blade is ideal for cutting tall grass and dense vegetation in the yard.Immediately replace the stuck old blades with our lawn mower blades and get a brand new lawn mower experience! Lawn Mower Blade fit for 84005221/ 2105200317A/ 2105200317，Before placing an order, please confirm that this is the blade you need. The simplest inspection method is to remove the old blade and find the part number printed on it.The lawn mower blades are compatible with the Hyper Tough 20 inch walking lawn mower MNA152701, Murray 21 inch walking lawn mower MNA 152901, MNA 152903, and Black Max 21 inch two in one gas propelled lawn mower MNA152905.