Ladder Extension allows the rescuer to attach themselves from their harness to a ladder rung or tower platform. Overall length of 18″ provides maximum for NFPA. Easy to operate double locking snap hooks at each end. The XL hook will open to 2.5″ to accommodate any ladder rung. The small end of the Ladder Extension attaches to the “D” ring of the rescue harness. Made in the U.S.A.