These safety chains are of a fantastic quality. I have been using them to secure a variety of fixtures to my Global Truss Trussing, including pars, moving heads, strobe lights and other intelligent fixtures. They give me the piece of mine to attach any fixture to my trussing, knowing that the extra level of security is there should any of my claps of fixtures fail. They are long enough to wrap around the entirety of my F33 Trussing, or twice if wrapped around a single bar twice. The carabiner is of a high quality and secures tightly with a small spanner. I would definitely recommend these to any professionals