This is a Manufacturer Sourced replacement part for Lawn and Garden equipment. This item is Metal an is Sold Individually. A lock nut is a type of nut that resists loosening when properly threaded onto a bolt. This Locking Nut has multiple uses based on your tool. You would need a Wrench to tighten or loosen this Hex Nut.
A genuine replacement part which is supplied directly from the original equipment manufacturer for use with Homelite and Ryobi handheld lawn and garden equipment. Please make sure to refer to the appropriate diagrams of your model for the correct location and application of this hardware. Keep in mind this high-quality screw is made of durable metal and is sold individually.