Pack of 10 3/8" BSC stainless steel nuts, UK manufactured.
These are nice quality UK manufactured BSCycle (26tpi x 3/8") full nuts in stainless steel, with chamfer on one side. They are typical of the type of 3/8" full nuts originally fitted to Norton motorcycles, othen than being made in non-rusting stainless steel.
I always keep at least one bag of these in my own fastenings box, for all rebuilds.