These legs are fantastic! Our son is in a high school band and we normally sit in the stands on our awesome StadiumChairs. She has a friend that is in a wheelchair and she likes to visit with her but the stadium doesn't have any folding chairs. These legs allow me install them on her StadiumChair in mere moments and she can take it down to sit with her friend, who has to sit in the walkway in the middle of the stands. They are SOLID legs. I'm a big guy and I don't feel the least bit wobbly on these. They only install in one direction so that the frame goes on each side of the chair's middle bar. This keeps it from moving forward/backward. Also, there are two heavy straps that cinch the legs to each side of the chair. Once it is on the chair, it doesn't move! This is a quality product.