This replacement item is supplied by the original manufacturer for use with Craftsman lawn and garden equipment. It is an identical replacement for a missing or a faulty locknut that was installed on a new unit. This is a standard hardware that was installed on a new unit, please make sure to refer to the appropriate diagrams of your mode...Read morel for the correct location and application of this component. Keep in mind this high-quality item is made of durable metal and is sold in a pack of eight.