Hook-Um Dano Ladder Locks for Contractors, Ladder Locks for Roof Rack The Hook.Um Dano Ladder Lock will lock and secure 1 or 2 extension ladders or step ladders down tight to your ladder racks, truck racks, trailer racks, van racks or roof racks. Easy on and off. What better way to protect your ladder investment. No tools needed. Installs in seconds. Padlock Not Included Made of Heavy Gage Steel.Corrosive resistant with an Environmentally Friendly Powder Coat Finish. Protects your ladders on and off the jobsite.Made in the USA