Description: Multiple arthrosis and adjustment points for perfect viewing angles. Ball design can minimize the shock and vibration,which is helping to extend the life of your camera. Compatible for GoPro Hero 6 5 4 3 and almost all cameras. 1/4 screws mount at the bottom(screws is not included). Equipped with spare aprons. Specification: Material: CNC Aluminum Alloy+PVC Diameter of Ball: 2.5cm /0.98inch Packaging Material: PE Package Includes: 1 Piece Ball Head Mount Note: Please allow a slightly errors due to manual measurement