A cast aluminum base with 2-way bolt pressure cable holder. Is suitable for parapets, flat machinery and other surfaces where mechanical mounting is possible. 5/16-18 stainless steel bolt and washer. 2-13/16 x 2-15/16 in. (71.44 x 7 x 4.61 mm); Approximately 4 oz. (113 g). Use suffix 1 /2 or 5/8 inch to denote air terminal size.