Nice clamp to lock air hoses, all made of plastic, strong enough for their job and all plastic means no rust at all. \ R \ nIn the inner side there are some protrusions to fasten the hose against slipping. \ R \ n \ " Quality \ ".... the plastic could be finished in a better way, there are many burrs, of course they can be easily removed with a little knife ..... 4 stars only for this reason.