Round Head Nail Galvanised Finish 65mm Bag of 2.5kg These Forgefix Round Head Nails are multi-purpose nails, for use with both soft and hard timber materials. They are galvanised for increased durability. Available in standard sizes, from 25mm to 150mm. APPLICATION: These nails are the most popular type of nail, used in many joinery and construction applications. Galvanisation is process of applying a protective zinc coating to steel in order to prevent rusting. Zinc coatings prevent corrosion of the protected metal by forming a physical barrier, and by acting as a sacrificial anode even if this barrier is damaged.