Item looks like a steel (probably high strength heat treated alloy) S hook with one end looped. I was just trying to mount it on the forearm of a Toyota light truck (*NOT* a car chassis modified into a "crossover" or some other "off-road vehicle"). The open part S is not wide enough. I suspect this could work on most modern cars and car chassis vehicles. If I knew what vehicles it could be used on, I might keep it to myself. Otherwise it will be returned unused.