Quad Lock Motorcycle Handlebar Mount Pro The Quad Lock Motorcycle Handlebar Mount Pro has all the features from the original Handlebar Mount but has been upgraded with sturdy CNC aluminum construction. The PRO comes in two sizes - to fit bars from 7/8 up to 2 - and offers discreet cable routing when combined with a charging head. Flexibility of the rotating head and included extension arm allow for multiple mounting configurations and optimum visibility. A dual stage locking mechanism makes attaching and detaching your phone from the mount is an easy, simply twist and lock in one motion. An optional Vibration Dampener is available to add to your Quad Lock mount for additional stability and reduces over 90 of high frequency vibrations produced by motorcycles. Sizing: Small: Fits handlebar diameters: 7/8, 1, 1-1/8 and 1-1/4 (22mm, 25mm, 28mm and 32mm) Large: Fits handlebar diameter: 1-1/2, 1-3/4 and 2 (38mm, 44mm and 51mm) Features: Low-profile mount for a discrete look Multiple mounting configurations Patented dual stage locking mechanism Easy attachment/detachment from phone case CNC aluminum construction and stainless steel hardware Optional Quad Lock Vibration Dampener provides additional stability (sold separately) Extension arm dimensions: 50mm from screw to screw and 75mm long Includes: 1 handlebar mount, 1 extension arm, 3 bar spacers and 1 allen key Note: Quad Lock Case sold separately.