RIVET SPECIFICATION: 2.4, 3.2, 4.0, 4.8, 6.0, 6.4MM; SHELL MATERIAL: ALUMINIUM ALLOY; ACCESSORIES MATERIAL: 35CRMO; COLOUR: BLACK ? RED (PANTONE 485), LOGO & ITEM NO. PRINTING; COLOUR OF BMC: BLACK, WITH LOGO & ITEM NO. EMBOSS