Fiberglass, type 1, class 4, spec mil-i-22023; 0.025 in. Thk rubber coating ; rectangular shaped; 9.250 in. Half circular hole cut into body along the width; 22.500 in. O/a lg; 15.688 in. O/a width; one hole 1.750 in. Diameter cut into body 5.125 in. From slotted end; 1.000 in. Thk o/a