ProGear Large Motorbike ATV Roll Bar Mount With 3-Way Pivot Arm Kit For GoPro Hero 4/3+/3/2/1 -Attention Sellers- ProGear Only Over 200+ GoPro Accessories In Stock Professional Order Handling And Service Arrives In 2-3 Business Days- 3.5cm-6.35cm Diameter Fully Inspected By ProGear Technician