This sturdy, lightweight ladder is manufactured from 1" square marine grade aluminum tubing. Quick Release systems are ideal for easy off-season or not-in-use storage. Angled design and large aluminum steps for a sure footing. Stainless Steel assembly hardware is included. Ideal for Pontoon boats as well as docks. 9-1/8" To First Step11" Between Treads5-1/4"D x 16"W Tread