This is an authentic replacement part sourced directly from the manufacturer. The screw is found in an angle grinder from Alpha. This part is made of metal, and is used in securing the gear box cover to the gear box. Please be aware that there are different screws used in the machine. Refer to the parts diagram to be sure of ordering ...Read morethe correct part. You will require a screwdriver when replacing this item. This product is provided as an individual replacement part.