Grating Clip is a galvanized carbon steel grating fasteners used to fasten stell bar grating to structural shapes where the structural flange is in a horizontal plane, for appropriate use, the maximum measure from the top of the grating to the bottom of the flange is 2.5 inches, it can be used on 22- spaced grating and 30- speed grating, it will work on 19- speed grating, but note that the grating bars will spread during tighting