Competition Discus Cage. All aluminum high school discus cage with 6 permanent in-ground sleeves and 4" square posts. Comes complete with sleeve caps. Posts are easily removable for storage. Meets High School specification. Special pulley system allows easy daily removal of netting. A 30" cantilever post for Offset netting provides for maximum protection. Net is 1-3/4" weather treated nylon with weighted bottom. Includes spectator warning signs.