How do drills drop

[bobby !!!]

What is the drop mechanic for drills and safe ?

[optimistic realization]

Via cards at the end of a heist.

[Rekalty]

Timed, seems to be 1-2 per week, safe/drill. Higher chance to get safes of course.

[я воняю]

They drop randomly via cards, like masks.
Recently was in a lobby with somebody who got a wolf card (drill) drop.

He left immediately after we got back into the lobby, presumably to sell it for several free dollars.
I mean, I can't blame him.

[Mojo Forever]

They run on a cooldown system of 5-6 days. Drills and Safes are in the same drop pool. You will Always get a Safe or Drill after the first heist you do, when the cooldown isn't in eFFect. Once you get either one, the cooldown starts and the cycle repeats.

Drills also seem to be pretty uncommon.