The ADP Volleyball System is a steel competitive volleyball system that offers the traditional design with unmatched strength for all levels of volleyball play. The durable 3” O.D. telescopic steel posts provide unyielding strength and support during regulation competitive games. A sleek black powder coating for the finish. The pin-lock mechanism gives a hassle free and quick adjustment to set the net for men’s, women’s and junior’s heights. To indicate post height there are engravings on the uprights. An internal spring system keeps the telescopic post from free falling inside the base post when the pin-lock is removed. The net cable is easily guided over the post with a pulley at the top for ratchet winching to the precise tension.