Grille Burglared

Tricircle padlock ia not too bad for indoor use (in fact much better than other cheap china padlock ).

Unfortunately the most attacked part is not the padlock, but the so called “Ear”or “Eye” of the grille.
Use a mortise lock on your grille, not padlocks. Padlocks type is actually an easy money for grille maker. So easy to make. But mortise type is harder, needs skillful welder and worker.

www.finelockshop.com
Advise from Locksmith, not salesman.