Unique Design: This roof and ridge hook is designed with two convenient wheels to allow ladders to roll along the roof without damaging the shingles. The ladder hook is designed with four mounting holes to accommodate the different spacing of the two steps at the top of different ladders. Rubber T-handle to prevent damage to the roof tiles and achieve a certain anti-slip effect. Durable Material: The ladder hooks, made of sturdy rectangular steel tube with a load capacity of 500 lbs, are essential equipment for roofers' protection. In addition, the universal wheels make it easy to transport the stairs to the roof, saving time and labor. Safety Essential: Its adjustable lock works to secure almost any ladder to your roof. The ladder hook is especially useful for working on weak decks, steep terrain, chimneys or antennas. Easy to Install: This ladder stabilizer comes with installation instructions, you can follow them and install it in minutes, very easy and convenient. Note that the wing nuts on both hooks need to be tightened to keep the ladder firmly in place. Applicable Ladder Types: The roof hook with wheel can be used on both fiberglass and aluminum ladders, single or extension ladders. Suitable for round and D-rung styles. Do not use on Type III ladders.