Galv Round Wire Nails 100 x 4.50mm 2.5kg are robust, all-purpose fasteners manufactured from carbon steel with a galvanised (zinc) coating for medium-duty rust and corrosion protection, making them ideal for both external and internal structural timber applications that fall under Service Class 2 standards, featuring a full round head for maximum clamping and a smooth shank for strong holding power in thick materials, with the dimensions of 100mm (4 inches) in length and a heavy gauge of 4.50mm making them suitable for joining thick lumber like fence posts, large roof rafters, and heavy-duty framing, and the 2.5kg pack typically contains an estimated 190 to 245 nails based on an average of 77 to 98 pieces per kilogram.