This 25mm blade nut is a fastener that secures the blade to the spindle or shaft of your lawn equipment. It is located at the center of the blade. Signs of a broken blade nut include looseness, stripping, cracks, or excessive wear. Failing to replace a broken blade nut can result in a loose or dislodged blade during operation. To unthread...Read more the blade nut on your machine, use a wrench or socket to loosen it. This OEM component is sold individually. To ensure you have the correct number of blade nuts for your machine, refer to the user guide as your equipment may require multiple blade nuts. Consider replacing all of the nuts in one go as they wear out at similar rates.