Most of mine are from Ideal, purchased at my local supply house. The type pictured is the most commonly used one.
I also have a few from Panduit.
One of my customers has large valve-wheel lockouts for putting on the door of the electric room when we have the panel open. Not a bad idea.
If there is ANY doubt in my mind as to the LOTO being honored, I will also take the additional step or removing the wires from the breaker.
If someone who should know better removes or defeats a lock-out, I'm off that job site until said person becomes unemployed.
