I think it is a left-handed caliper, because the letters on the adjustable wrench look normal.

Perfect depiction of what NSFW should be.

After a brief search, indeed, there are not many English sources for this ammo type. I have only found this: https://forum.cartridgecollectors.org/t/iskra-7-62x39mm-5-45x39mm-and-9x18mm-sabotage-cartridges/52606/4

From Russian sources - this ammo was used to clog the barrels of guns. Was produced in 9mm Makarov, 5.45x39 & 7.62(pictures in reverse order.) This ammunition wasn’t any different from regular, including weight and markings.

These would defragment/split into pieces inside the barrel, thus rendering the gun sabotaged. These would be issued to Afghanistan soldiers, who would intentionally “lose” several boxes on the battlefield, and if the enemy picked and used the rounds, their guns would be sabotaged.