The Topfinger Difference Steel hook ends, cast in black plastic, held into place with one rivet on each each Hook-end has a curvature that mate up with the curvature of the upright High-Strength, anodized aluminum Smaller buttons makes for quick transition when telescoping Punched, cut, and riveted in our factory, ask us if you need customization to any of our standard sizes Telescoping Ranges On Each Support Velcro stick on full crossbar Selling Point: Hanging 30KG on any sizes of drape support:  EASY! Size is as follows: 3′ – 5′ drape support  4′ – 7′ drape support  5′ – 8′ drape support  6′ – 10′ drape support  7′ – 12′ drape support 8′ – 14′ drape support 9′ – 16′ drape support