Simplex Nails, Inc. is a manufacturer of the cap nail. They produce metal nails including "Original" Simplex Cap Nails and Mega Cap - also available with square cap. Plastic nails include Plex-Cap® and Tube-Lok®, Turbo Tube-Lok® and Base-Lok® Fasteners. They also have Masonry Cap nails insulation, Zanchor Drive nail fasteners and Galvalume Disc, which has rupture resistance to softer materials and Rust-Lok® coating protects shank and cap against moisture & corrosive materials.