For use with all types of builders metal work. The twisted shank gives an enhanced pull-out resistance. For medium duty rust protection Conforms to Eurocode 5 and service class 2" Shank Dia. mm: 3.75 Length mm: 40 Material: Carbon Steel Approx. Pcs Per 1kg: 312 Timco Square Twist Nails - Sherardised (Size 40 x 3.75 - 1 Kilograms) in Black