Because of the "rounded" shape they must be gear teeth? Which would indicate that there's a gear wheel to the left or to the right.
If not a gear, per se, then a ratcheting device, like on a citrus squeezer.
Corkscrew? It can't be, as that is nothing like a carving knife.
It may be just a subconscious awareness but are the majority of your answers to this "quiz" all to do with booze?
At least my answers aren't to do with testicles.