The black Visidec Spacedec Quick Shift Donut Display is designed to be used with the Spacedec Display Pole, making it possible to attach an additional display. The unit works with poles that have a diameter between 1.65" and 2" and features a quick shift lever so you can quickly move and lock the display freely along a pole without using any tools. The Quick Shift Donut uses a ball joint that allows infinite and easy display adjustment for any viewing angle range up to 20 degrees in any direction. Even after the screen has been installed, it is easy to change its position from landscape to portrait orientation. Then, you can securely lock it into position. The built-in Quick Release mechanism ensures hassle-free and secure removal or replacement of the display.