22-3F Fiberglass Rail Shields are designed to reinforce the bottom of the ladder to protect from damage on the jobsite. Shields may also be used to repair ladder if rail cracks occur no higher than 3/4" below bottom rivet of bottom step or horizontal and all holes in the rail are intact. Shields come with mounting hardware and instructions. For the front rails of the following series: 7400 (up through MK 12), T7400 (up through MK 10), P7400 (up through MK 12), PT7400 (up through MK 3), E7400 (up through MK 6)