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.