bad idea: the little slot in the back of the medicine cabinet

Safe Razor Blade Disposal razor blade slot medicine cabinet medicine cabinet , was there anything ? Only the razor razor blade slot medicine cabinet So it goes into the wall and inside of it Pretty durable little piece Anybody know what that's for? So that little slot is for straight razors When the

razor shark slot The interior wall of my medicine cabinet is wood and the wall behind it is drywall What are the minium tools I would need for the job and how