Deluxe Indoor Aluminum Tennis Post is a smaller version of the Gared volleyball system and is ideal for multi-sport facilities • 4" O.D. upright is constructed of a strong, yet lightweight anodized extruded aluminum for superior support and long life • Easy-to-operate ratchet winch sets net tension • Exclusive wedge lock holds sliding rail system securely • Use GSTNET30LS tennis nets, sold separately