they are called dog dish for a reason. but the non-vented ones hold more water.
I was known to drop small rocks, marbles, BBs and the like in all the local copcars that had them back in the day.
till I got busterd fer it, then 2 weekends of washing cruzers or tell my folks.
you know back in the good old days with Malloy & Reed or Andy & Fife
disclaimer...if you find any rocks, marbles, BBs in those caps OR they go missing...I didn't do it!
I run caps & lugs with 85 poverty rims that came on my stepside.