Corrosion-resistant, zinc-plated, painted with white baked enamel. Three 3-1/4 x 1 x 1-1/8 in #107 compact lights attached to each bar. Lights have acrylic lenses that lock into base to protect against being knocked out. Mounts on 16-1/2 in centers and grounds through mounting hardware. 16-1/8 in W x 1 in H x 1-3/8 in D, 16-1/2 in L with mounting brackets.