I like the heavy material they made the green hook out of. I'm assuming it's mild steel and will take some time to cut with a handsaw. An angle grinder does this job in half a minute. The lock is stamped from stainless steel. I don't think he can take a few hits with a hammer. I will keep and use it because it is used to prevent someone from rolling back the trailer. That was all I had in mind anyway. Maybe a master lock will increase the efficiency of the device?