One of them has a base that is a different model and make of the other three and that is made by A&E systems with a part number of 92705. The one that has a different base also has the other end with a base that I had to cut off the floor with my angle grinder because the screw would not turn out and there are some damage to that base and that may be seen in the pictures. I will ship the one without the cut in it to the first buyer and that one has two bases that are relatively identical and are made by the same company. I'm listing these for parts and not working, one for sure has a damaged base. Please use the pictures to help determine the condition of these items. I am selling these items as is. The one with the least damage is the one shown in the first 12 pictures. There are some oxidation of the metal on or the bases on two of them and that is from where they were mounted to the floor and moisture was in contact with them. I did wire brush them off some to show that there is some metal left and I would say the metal that is left has some integrity.