They fit 1/16th very well.
The washers are exceptionally flat, most small scale washers I've used before have needed a little tap on the anvil to flatten but these don't.
I initially thought the interior hole was a little large but brass rod peens easily, and I've used them on 5 or 6 razors now and they've done an excellent job.
The exterior diameter is small enough that they can be used as an exterior washer, not just as an interior washer.
They do their job about as well as you could ask for.