Cap a tread alder springs oak 47 in length x 12 1/8 in. Cap a tread hayside bamboo 94 in length x 12 1/8 in deep. Stair riser thepoultrykeeperclub. Cap a tread glenwood oak 47 in length x 12 1/8 in deep x. Cap a tread riverbend oak 47 in length x 1/2 in deep x 7. Width of stairs beautiful railing extensions on stairs. Treads and risers salmaunme. Stair treads and risers dimensions a more decor standard. Ez stairs free stair calculator.