Caveat: I have not tried, whether the metal a sledgehammer resists (with chisel). Also my battery-Flex I have not tried. But at first glance, as part robust. Something I was panicked after mounting: The discus lock did not fit. Reason: The hasp is adapted with millimeter precision to the discus lock. The door is made of sheet steel and are for something, if you mounted the Rigel; Thus the bracket was pulled slightly inward ... and the lock did not fit. So I had very complicated with washers and screw adhesive work. Yes, the devil is in the details.