This item has multiple extra pieces and an incorrect instruction manual. It took me three hours to put it together and I had to accomplish it by removing a few pieces. I read the instructions about 7 times to make sure it wasn’t user error but I found that there were many more bolt threads installed into the frame than what was needed. This prevented complete assembly according to the book. Furthermore, the size chart that I utilized did not accommodate my dog even though I measured twice to check for the correct size. The large is definitely not big enough for a large dog like mine which is seventy pounds.