This is the locking pin set for the m38 cavalry carbine Carcano rifle, folding bayonet style. This seems to be a very common item that needs replaced because it is often broken or missing. There are 3 pieces: screw, nut and spring. These are new-made, from an original sample and every one has been test-fitted to an original rifle. The pin and nut are made of low carbon steel with all details present. The spring is new and not exact to an original, but it fits and works correctly. This spring is stronger, which actually helps lock in better (an upgrade from the original). All parts hot process black oxide treated for long life and will hold their finish.