Annular rings provide additional holding power, where increased grip is required. For medium duty rust protection Conforms to Eurocode 5 and service class 2" Shank Dia. mm: 2.65 Length mm: 50 Material: Carbon Steel Approx. Pcs Per 1kg: 440 Timco Annular Ringshank Nails - Sherardised (Size 50 x 2.65 - 0.5 Kilograms) in Black