I have a Marcy em/1 weight machine that I bought millennia ago (true). I decided that I should make him better so he would lure me down to the basement to put me back in my place. The 2x2 crap plugs that came with it were junk and kept falling off. They require a hammer to install (1.5 pounds worked great) and they will never fall off again. They fit nice and snug and the fins hold them in place really well. It's always nice to buy something that not only works, but is exactly what you intended. I highly recommend it.