A Vise Jaw Extender

[Toolmaker51]

Every used vise I've seen looks like swiss cheese. Nice solution to not making a trip to the wood shop to cut a custom dunnage piece.

Swiss-cheesed vises, yup seen LOADS of them. Occasionally, tables of corresponding machines carry same manner of decoration.
I'll bet most holes are by inept users, a tiny percentage [legitimate?] accidents.
Either way one thing is common; aren't drilled-in by who paid for the vise...