i made this necklace with a 22 magnam cartridge.
Step 1: Materials
drill bit (bigger than necklace)
put the drill bit in the drill and then put the bullet casing in the clamp.
take the drill and drill into the cartridge. Make sure to go through both sides evenly.
feed the necklace through the freshly drilled holes.
Step 5: Finished
you should have a necklace with a used bullet cartridge. If any problems message me.