Large diameter head, perfect for attaching roofing felt, slate and shingles. Provides high levels of rust protection" Shank Dia. mm: 3.35 Length mm: 38 Material: Copper Approx. Pcs Per 1kg: 300 Timco Clout Nails - Copper (Size 38 x 3.35 - 2.5 Kilograms) in Gold