3/16" hex drive Full Bore countersunk and dome head fasteners are available in a variety of specifications. ARC stock countersunk zinc plated steel fasteners 0.500" long, and lightweight aluminium versions of the same fastener also in the 0.500" length. We stock the dome head fastener in zinc plated steel in the 0.500" length. All fasteners use the large mild steel mounting plate shown and the S6-425 spring shown. Also in stock is the handy Full Bore removal tool, or a 3/16" 'T' bar or allen key can be used. Where the countersunk fasteners are used on a painted surface, stainless steel washers are available for protection. Also available, but not shown in the photo, are teflon washers for use with the dome head fasteners.