Round magnets

I was just thinking the other day! I know scarey but I have made my share of guards at a place I used to work at and allot of times these guards were split in order to open them so I used small round magnets sometimes to hold them up in place to work on pulleys and such. I don’t know how big they make these but I have a couple here at home about 2 inches in diameter and my Condor tank is about 2 1/2 in diameter has anyone ever tried to use this for the end of an air tank to mount butt plates? they also have a hole in the middle of them for a bolt to go through. Just curious once these are mounted on the steel tank of an Airforce gun it would be almost impossible to move it by turning or pulling on it, like I said just a thought Eddie