Riser shelves for Smith System Works Desk Series16"D riser shelves adjust from 12-22"H. Clamps secure risers to desk tops. Available in 4 finish combinations: 06 cherry top/charcoal/black, 69 grey top/nebula/navy frame, 75 light oak top with black frame, 85 natural maple top/charcoal/natural.To view finish combinations, simply click on View Swatches located above.Once item is placed in cart, you will be prompted to specify your finish.Overall dimensions: SM17647: 12-22H x 36W x 16"D SM17648: 12-22H x 48W x 16"D SM17649: 12-22H x 60W x 16"D