Except I’ve never seen a 25.4 mm wrench or socket marked as such. At least not in a metric set. Mine are all marked 1”.
I had one...but it disappeared along with the 10MM. Came in a combo set, but the strangest thing. The set included 1/4, 3/8 and 1/2 inch drive ratchets, but nothing for the metric sockets. I had to buy those separate.