Replica Michell part used as greeblies on Boba Fett's boots and knees, supertrooper blaster, R2 zapper arm, maybe on the Jabba gate keeper droid, although they might look a bit more pointy on the droid. And probably in a lot of other places!
approx 12.3mm diameter, 31.5mm long aluminium part. M4 threaded hole on the side, M5 on the bottom.