Have you noticed lately that the blade on your Blackmax mower is getting dull or maybe damaged? Replace it with our 21” Lawn Mower Blade. This blade is optimized for gas mowers to help improve cutting efficiency and increase runtime. Made from hardened steel for extra durability, the high-performance blade fits all Blackmax 21” mowers. In addition to the blade, it also comes with an operator’s manual and a 30-day limited warranty. We recommend wearing work gloves to protect your hands while installing this part.