Best Christmas Gifts for Contractors?

I know this is a little out there (I don’t think this violates any of the rules necessarily). My new father in-law is a contractor and I am really struggling to think of something to get him. Are there any gifts that you have received or would love to get as a contractor? Doesn’t necessarily have to do with contracting but just trying to relate to a middle-aged man in your field.

Thanks for any suggestions!