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a plastic cap , which locks over the washer, providing an air & watertight seal that protects the fastener head from rust and corrosion. Because they're UV-stabilised and entirely seal the head of the fixing, Snap-Caps are ideal for outdoors in addition interior applications. Even in severe environments, Snap-Caps can be expected to final for 10-15 years, all the whereas conserving the screwhead against corrosion. Note: available size M6,M8,M10,M12,M14,M16,M18,M20,M22,M24,M30, M35,M40,M42,M45,M48,M52,M56,M60,M64,M68,M76,M89,M114 for length over 30mm, please message if you need them,10pcs a package for those sizes, please be noticed