Forgefix round head nail galvanised finish forgefix 500nlrh40gb 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 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