Finish up your bag straps or add decorative details with these Double-Cap Rivets (both the front and back look like a smooth round cap). ++You need the Rivet Setter & Anvil set. This starter set includes a hole punch, and has everything you need to set rivets! IRIDESCENT RAINBOW - Sold in packs of 20. OTHER FINISHES - Sold in packs of 50. Measurements: Small: 5/16" Caps x 1/4" Post (8mm x 6mm) Medium: 3/8" Caps x 5/16" Post (9mm x 8mm) Large: 3/8" Caps x 7/16" Post (9 mm x 10 mm) X-Large: 3/8" Caps x 1/2" Post (9 mm x 12 mm) **Actual colour may vary from what you see on your screen. Copper plated rivets are covered in a shiny lacquer coat so that they will not tarnish! Our Copper finish is more of a pink/copper than an orange/copper depending on the lighting. It looks a lot like "rose gold", but without it containing actual gold.