I needed (three) of these to plug (old) holes in my mailbox (to keep it watertight) (i.e.) after replacing my (old broken) mailbox flag with a new one (which required two new holes were required). ). The only way I could find to buy them was to buy a bag of twenty-five. Someone needs some extras (just kidding). I need to make those (three) holes in the old mailboxes a bit bigger to fit those (slightly larger) plugs.