This is an authentic ZenitCo PT-1 and PT-3 5.5mm Lock Hinge. They have been imported from Russia and are 100% original ZenitCo.
Machined out of steel and built to work with the PT-1 and PT-3.
The 5.5mm Lock Hinge is needed to use our PT-1 to 1913 adapter. If you already have a PT-1 or PT-3 with a 4.5mm adapter you can easily swap it out with this part.
Also included is a 5.5mm Pin.