This is a genuine OEM sourced replacement screw which is commonly utilized on lawn and garden equipment. It is a standard hardware which has multiple applications based on the model of your unit, please refer to appropriate diagrams for the correct location and use of this part. It is a high-quality hex head screw which is made of durable...Read more metal and it is sold individually. Over time threads may wear out or it may simply get lost eventually requiring a replacement, note that a wrench will be needed to install or remove this hardware.