The From the Anvil 3\" Rosehead Nails (1kg) Black Oxide are sold as a 1kg pack - this contains on average around 84 nails. Each nail is 82mm (3\") long and the head size is 11mm x 8mm. Black Oxide Nails The nails have a black oxide finish and can, in theory, be used internally or externally. Please note - being used externally they may be prone to grey staining and bleeding, especially in oak. Other Variations It is also available as 1\", 1 1/2\", 2\"or 2 1/2\" sizes - sold as separate products.