Forge Fix-Spring-Head-Nail-Galvanised-Forge Fix-500NLSH65B-p-These-Forgefix-Spring-Head-Nails-are-a-popular-roofing-nail-for-corrugated-roofing-Their-twisted-shank-assists-in-absorbing-movement-that-may-occur-in-the-roofing-construction-They-are-galvanised-for-increased-resistance-to-corrosion-Galvanised-spring-head-nails-are-most-commonly-used-for-securing-corrugated-sheeting-&-other-roofing-materials-Can-be-used-with-a-rubber-or-plastic-spat-washer-Galvanisation-is-process-of-applying