PATENT DESIGN: 1.The roof ladder hook design Multiple mounting holes you can select the appropriate mounting holes ,according to the ladders with different spacing steps, in order to achieve the desired effect, Attaches to most style extension ladder,Compatible with round or D rung styles little giant ladder accessories. 2. With Rubber Grip T-Bar for Damage Prevention roof. ENHANCED:Ladder stabilizer for roof Made of heavy-duty steel with water and rust-proof finish, this ladder accessories for roof features extreme strength and superior durability ensuring safety while climbing on the roof. They can hold a load capacity of 380 pounds and service long-term life.