Bee hive nails.
1½ inch, 40mm x 1.6mm, round lost head, zinc plated rust proof.
50g pack contains about 80 nails. Note that each National box requires 20 x 1½ inch nails and 20 x 2 inch nails.
Bee Hive DIY Frame Pin Hammer
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Bee Hive Frame Pins, 19mm, 20g/150
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Bee Hive Nails, 50mm, 100g/80
Bee Hive Nails, 25mm, 30g/75