Description: Aluminum oxide ball clamp ball head plug-in filling light or used for GoPro cameras. Multi-position connection fixed, 360 degree rotation. Strong practicality,and it is perfect for photographers. High strength, corrosion-resistant, high flexible changing joint. Surface treatment: premium hard-anodized wear-resistant topcoat. Specification: Material: Aluminum Alloy Ball Diameter: 2.5 cm/1" length of Ball: 5.5cm/2.1" Size of Ball Clamp: 6×5.2cm/2.3×2.0" Customized ball head base for GoPro Hero 2 3/3+/4. Package Includes: 1 Piece Ball Clamp 1 Piece Ball Arm