The non-penetrating tripod mast assembly is constructed of galvanized steel and requires no drilling to secure the frame. Mast includes a tripod assembly, angled steel base and one mast extension. Tripod height 48 inches (121.9 cm). Mast extension height 48 inches (121.9 cm). Angled steel base 35 inches x 29 inches (88.9 cm x 73.6 cm). Choose this option for flat membrane roof installations.