Felt Nails - Galvanised Clout Nails 13mm x 3mm Known in the trade as clout head nails or felt tacks, these nails have an extra-large head to prevent rips and tears in your shed roofing felt. Our clout head nails are heavily galvanised to ensure that they remain rust-free in all weathers. With a sharp, diamond point and a ridged shank, these nails are quick and easy to drive home. Always use galvanised shed felt nails to achieve a professional, long-lasting finish when you work with roofing felt. Specification: