The wing nuts appear to have been paint coated while screwed onto the bolts, making it difficult to remove the wing nuts. Hand tightening them to attach to kennel was also difficult, the threading seemed off. The wings on one of the nuts both broke off in my hand while I was trying to attach them. There is only one bolt on each hanger causing the bowl loop holders to hang crooked when my tiny 12 lb.dog attempted to eat from it. These hangers are made of very flimsy material. The bowls are fine, although made from very thin metal. I wouldn't buy this type again. I must praise Amazon for offering easy to print out, prepaid shipping labels for return. So happy, that I have already ordered another set of 2, of a different type.