Complement your mower solutions with the RYOBI 21” Lawn Mower Replacement Blade. When lawn mower blades are regularly maintained, the mower’s cutting efficiency and runtime increases for an overall better mowing experience. Feel confident in your cut as this blade is made with hardened steel, making it dependable and durable. For best results, replace your mower blade every year. Complement your tool collection with RYOBI Accessories. The RYOBI 21” Lawn Mower Replacement Blade is compatible with RYOBI 21” Lawn Mowers RY401130/RY401013, RY40LM10/RY40LM01, and includes 21” Mower Blade and Operator's Manual.