Similar to the International but instead of using an internal screw rod mechanism to attain net height, the Master has a spring assist that allows the post to glide easily up and down. A four point net attachment lets you set up the system in minutes and allows full height adjustment to 8'. Telescopic design allows fine height adjustment without removal of the net. Easy to operate no kink linear winch features hardened steel gears and a threaded rod. Telescoping internal tube travels on nylon bushings metal never travels on metal for smooth operation. Exclusive wedge lock holds rails securely much more effective than locks used by other sliding rail systems. Lightweight, extraordinarily strong, 4' diameter anodized 6063 t6 extruded aluminum. Upper portion of post telescopes inside the bottom section and internal spring assist makes it easy to adjust net height. Master Telescopic 1 Court System without Floor Sleeves and Floor Sleeve Covers includes the following 1 Master Up