Martin Universal Design Creative Side Tray Kit for Art and Craft Tables, Black, is designed to fit smaller table tops of 24" depth. Set includes two (2) interlocking pieces and brackets to attached to tabletop side. One tray has three (3) compartments with a 6-well station to hold drawing instruments or pens upright. A second tray is open for storing longer items. Overall dimensions when interlocked: 23. 5" L x 2. 5" W x 1. 5" D.