Super Erecta Horizontal Dividers for use with 24" deep dividers. Requires two dividers. Mounts across two dividers to form a light duty storage tier. 25 lbs. (11.3kg) load capacity evenly distributed. When used with 21” (533mm) tall dividers, the horizontal divider can be positioned at the midpoint or the top of the dividers. When used with 8” (203mm) tall dividers, the horizontal divider can be positioned at the top of the dividers.