Whisper 100 and 200 tower kits come in 24' (7.2 m), 30' (9 m), 50' (15 m), 65' (19.5 m), and 80' (24 m) heights. Each tower kit comes with all hardware necessary to install a tower, except guy supports, pipe and cement. All parts bolt or clamp together and no welding is required. These tower kits use 2 1/2 inch (63.5 mm) CQ40 fence pipe or schedule 40 water pipe. Actual O.D. is 2.875 inch (73 mm).