This replacement screw is a genuine item that is sourced from original equipment manufacturer. It is a high quality hardware that is commonly used with walk-behind lawn mowers. This screw has multiple uses depending on your model. Please make sure to check appropriate diagrams for correct location and use of this hardware. You will need a wrench when working with this screw.
OEM stands for Original Equipment Manufacturer. Simply put, this means that the company who made your appliance is also supplying the replacement part for it.