Z-Light exclusive clamp. Z-LIGHT (Z-Light), with a history of over half a century, is an arm stand Z-Light that combines high practicality and design. ■ Top tightening clamp ■ Easy to install without the conventional screw-in part ■ With a hexagonal wrench storage for arm adjustment ■ Mountable up to 45mm thick ■ Z-Light exclusive ■ Please note that a flat surface of 40mm or more is required for clamp installation. ■ Incompatible models: Z-3500/Z-3600 Brand new, unused. I am selling it because I accidentally purchased it.