This is a Factory OE long-head radiator bleed screw as supplied with 1979-on Fiat and Bertone X1/9s.
Fully compatible on earlier versions of X19 and Lancia Scorpion/Montecarlo, which were supplied with a unit that had a shorter head.
8mm hex head.
Condition: USED (8 of 10)
Good used condition, threads are clean.