Silverline Threaded Rivet Insert Tool 4 - 8mm Sets threaded aluminium rivnuts into thin materials, including sheet metal, plastic and fibreglass Permanent and reliable fastening Ideal for hard-to-reach locations Soft-grip handles Includes 4, 5, 6 and 8mm (M4, M5, M6, and M8) threaded inserts, mandrel tool and handle clip.