Versatile design fits all devices from 1.7"-3.5" wide. 360 degrees ball-joint design. Fully-covered one-piece clamp fits 15.8-25.4mm (0.62-1") round tubes and 19mm (0.75") square tubes. No tools required! Features: Versatile design fits all devices from 1.7"-3.5" wide 360 degrees ball-joint design Fully-covered one-piece clamp fits 15.8-25.4mm (0.62-1") round tubes and 19mm (0.75") square tubes No tools required!