This is an oil pan and transmission drain plug with magnetic center element. 22mm.
Used on most Fiat cars including the 124, 131, 128, Lancia Scorpion and Beta and others.
Has a standard 17mm hex head with pipe-style tapered thread that seals as it tightens.
Can be used as an alternative to the flat fit plug on Fiat 850 and X19 alloy pans.
New and unused.