We take great pride in our cages, hinges that are custom made to be very strong and still look good, no door hinges here. All steel construction, fully welded and powder coated, we use round ¾” bars for a much better look. Heavy duty nuts are welded into the outer frame rails so there are never any bolts sticking out of your cage. We use Allen headed bolts so your puppy will not be able to take the cage apart without the proper tool. Overall just a far superior cage design than is the norm.