THIS PRODUCT HAS BEEN DISCONTINUED. LAST TIME PURCHASE DATE - JUNE 14, 2018. UNICELL Mounting Mast, for 511 mm (20-inch) enclosures. Interface flange welded to a 10 ft (3 m) steel mast pipe. The mast can be used with standard wall or pipe mounting kits to provide an inexpensive mounting system. Custom lengths are available upon request.