This flange lock nut is a metal component used in many types of lawn and garden equipment. It is the part that attaches to the rear wheel to keep it steady on any kind of terrain. It can also be used on handles and chutes for some equipment. The nut size is 3/8 and it has a thread size of 16. Most flange lock nuts will last for years. In some cases, the silicone ring inside the nut will wear down when it is loosened and tightened. When this happens, the flange lock nut will start to move around. It can start as minor slippage but often gets worse over time. It will need to be replaced but this is a simple task. Regardless of what equipment it is attached to, it simply needs to be unscrewed. Take off the old nut and replace it with the new one. This flange lock nut is an authentic OEM product that is sourced directly from the manufacturer. It is sold individually. The lock nut is made for use with lawnmowers, wood chippers, and edgers manufactured by MasterCut, Yard-Man, Bolens, Craftsman, Cub Cadet, Murray, Troy-Bilt, Yard Machines, MTD, and Huskee.