This is a high-quality hardware which is sourced from the original manufacturer for use with Ryobi orbital jig saws. It is one of the screws which helps to secure the base plate, please refer to the appropriate diagrams of your model for the correct location and application of this part. Over time the threads of the head slot may wear out...Read more eventually requiring a replacement to ensure the tight fit. Keep in mind this durable metal Phillips head screw is sold individually.