Bimetal Cover Rivet Diameter: 3mm~12mm Length: 5mm~40mm Bimetal Cover Rivet Material: Carbon Steel, Stainless Steel, Brass, Aluminium and etc. Finished: White Zine, Black Zine, Blue Zine, Yellow Zine, Chrome, Nickel, Brass, Trivalent Chromium White Zinc, Trivalent Chrominum Color Zinc and etc.