a plastic cap , which locks over the washer, offering an air & watertight seal that protects the fastener head from rust and corrosion.
Because they are UV-stabilised and entirely seal the top of the fixing, Snap-Caps are superb for exterior in addition inside applications. Even in severe environments, Snap-Caps would be expected to final for 10-15 years, all of the whereas protecting the screwhead opposed to corrosion. Note: out there length 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'd like them,10pcs a package for those sizes, please be noticed