Middle Atlantic SP-5-21-26GY The Middle Atlantic Slim 5 Series Removable Steel Side Panels SP-5-21-26GY (Gray) are solid steel side panels designed for use with Middle Atlantic Slim 5 Series racks. Add an additional layer of protection and security to your set up. These panels are equipped with recessed lift handles and their own locking clips. Vents at the top and bottom of the door ensure adequate airflow and keep your equipment cool. Panels are constructed from 16-gauge steel and once installed add 5/8 inches to the cabinet's overall width. This item includes one pair of side panels and is designed for use with Slim 5-21-26 racks.