This replacement part is OEM sourced to be used with lawn tractors, cultivators, snow throwers, power rakes, furrows, and walk-behind lawn mowers from MTD, Yard Man, Bolens, Troy-Bilt, Yard Machines, and Ryobi. The metal hex nut is used with several different types of machines and the application of the nut can vary based on the model of the equipment. This item is available as an individual replacement part.