Aluminum "U" Channel Extrusion. Product Dimensions: 78" x 3/4" x 1/2" Product Material: Aluminum. Installs as a protective and cosmetic capping to the top edge of case partitions. Accommodates any 3/8" thick material. For quantities exceeding 4 lengths of extrusion, please call 800-822-7827 for the most economical means of shipping, or use your own carrier and account at check out.