The Qualcraft 2-Rung Aluminum Ladder Jack is MIG welded with riveted construction for strength and durability. This high-quality ladder jack works on either the inside or outside of the ladder s face and accommodates up to an 18 in. wide plank. Adjustable to fit round or D rung ladders the jack supports up to two workers plus 75 lbs. between two ladders providing solid support for a wide range of jobs.