1、【Adjustable Mount Hole】You can select the adjustable mounting holes according to the ladders with different spacing steps.Attaches to most extension ladder.Compatible with round or D rung styles.  2、【Anti-slip Rubber Grip】Ladder stabilizer with anti-slip rubber grip T-Bar for damage avoidance of roof,and keep you safer when climbing on the roof. 3、【Durable Material】Roof ladder made of heavy-duty steel with water and rust-proof finish, this ladder accessories for roof with extreme strength and superior durability. 4、【Strong Load Capacity】Roofing tool extension ladder with 500 pounds load capacity,ensuring your safety while climbing on the roof and durable for long lasting use.  5、【Easy To Install】Easily attaches with ladder roof hook installation instruction.Please NOTE: the wing nuts of both hooks need tightened to hold the ladder firmly in place. 6、【Widely Used】The extension ladder stabilizer is heavy duty,fit for single or extension ladders in wood, fiberglass, or aluminum in both round and D rung styles and most others. Features: 【Adjustable Mount Hole】You can select the adjustable mounting holes according to the ladders with different spacing steps.Attaches to most extension ladder.Compatible with round or D rung styles. 【Anti-slip Rubber Grip】Ladder stabilizer with anti-slip rubber grip T-Bar for damage avoidance of roof,and keep you safer when climbing on the roof. 【 Material】Roof ladder made of heavy-duty steel with water and rust-proof finish, this ladder accessories for roof with extreme strength and superior durability. 【Strong Load Capacity】Roofing tool extension ladder with 500 pounds load capacity,ensuring your safety while climbing on the roof and for long lasting use. 【Easy To Install】Easily attaches with ladder roof hook installation instruction.Please NOTE: the wing nuts of both hooks need tightened to hold the ladder firmly in place. 【Widely Used】The extension ladder stabilizer is heavy duty,fit for single or extension ladders in wood, fiberglass, or aluminum in both round and D rung styles and most others. Specifications: Material: Steel Load Capacity: 500 lbs (250 lbs/hook) Package Weight: 4.3kg / 151.6oz Package Size: 440 * 350 * 75mm / 17.3 * 13.8 * 3.0in Packing List: 2 * Ladder Hooks 1 * Mount Screws 1 * User Manual 2 * Ladder Hooks 1 * Mount Screws 1 * User Manual