[ Aluminum]Aluminium flat washers, high hardness, not easy to rust, non-deformation, wear - resistant and corrosion resistant[BRUSHED SURFACE]surface brushed treatment, surface could reduce friction between fasteners; seal prevent leakage, isolates, prevents loosening or dispersion pressure.[LIGHT WEIGHT BIG VALUE]Aluminum durable washers, light weight/wear resistance, corrosion resistant. Suitable for automotive or electrical applications such as oil lines, hydraulic fittings, oil drain[FEATURES] Not easy to rust, good tensile strength, moisture-resistant, oxidation resistant; no pollution, non-toxic, no pollution; fine workmanship, -constructed pieces, corrosion resistant, acid, and corrosion resistance. Tighter seal they compare with rubber washers.colour:silverMaterial:Aluminum alloyPackage Contents:45 x M6 x 10 x 1mm Flat Washer45 x M6 x 12 x 1mm Flat Washer45 x M8 x 12 x 1mm Flat Washer45 x M8 x 14 x 1mm Flat Washer40 x M10 x 14 x 1mm Flat Washer40 x M10 x 16 x 1mm Flat Washer20 x M12 x 16 x 1mm Flat Washer20 x M12 x 18 x 1.5mm Flat Washer20 x M14 x 18 x 1.5mm Flat Washer20 x M14 x 20 x 1.5mm Flat Washer20 x M16 x 20 x 1.5mm Flat Washer20 x M16 x 22 x 1.5mm Flat Washer20 x x 20 x 1.5mm Flat Washer20 x x 24 x 1.5mm Flat Washer20 x M20 x 26 x 1.5mm Flat Washer10 x M22 x 27 x 1.5mm Flat Washer10 x M22 x 29 x 2mm Flat Washer10 x M24 x 29 x 2mm Flat WasherOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.