LeveLok LL-STB-1 AL, Ladder Leveling Kit for Standard Ladder RailsCondition:* New Stock, In OEM Packaging. Some Shelf-Wear From Storage.* As PicturedAdditional Notes:* Permanent Mount Style* For standard ladder rails, up to 3/8″ thickness (thickness refers to the Inner Web)* Installs on most aluminum and fiberglass, extension, combination and articulating ladders* Rated up to 375 pounds.* Locking system: Stainless steel, double-row ratcheting…adjusts up to 10 in 3/16″ increments.* Fully automatic, “back-up” safety lock…keeps leveler “locked” until weight is removed from leg.LeveLokLL-STB-1 AL