There is a varation of these with no hole through lengthwise. They seem to be
the older ones. I find no mention of this, but there is a difference in use.
A mention in the entry could be appropriate.
Best regards,
Olof
[...] (Part 3673) The catalog entry already has a note about variants, as well as an additional image showing both the thick (older) and thin (newer) walled [...] (33 months ago, Sep 2, 2021, to Catalog Requests)