Steel; 0.125 in. Thk; bent to form angle; one leg 1.750 in. Lg; other leg 1.250 in. Lg; 18.375 in. O/a lg; largest leg lg has slot 0.500 in. W 17.250 in. Lg w/retaining clip and bumper at closed end of angle; other leg 2 mtg holes 0.368 in. Dia; guide painted white o/a