Flexible Arm Mount Office Tablet Holder for Yesido C33 Cell Phone Holder Yesido C33 Adaptable Tablet Stand for Phones. 4–11 inches in size. multi-angle, 360-degree rotating viewing. four helical pivot points and adjustable angle in multiple directions. With its silicone-impregnated surface, you can hold or remove your tablet or smartphone without getting scratches. The center of gravity is more stable because of the metal that is integrated into the chassis. You can reserve your device's charging port.