Fangrui Product Features 1,Made of quality aluminium alloy material, anti-deformation, anti-rust, sturdy. 2,Aluminum alloy ball socket, meet the requirements of highly accurate and durable. Smooth surface, will not scratch your equipment. 3,Lightweight, easy to carry and use. 4,Bottom for 1 or 4 screw, fit for most of camera equipment. Good accessory for photography enthusiasts. 5,Compatible for DJI OSMO ACTION Gopro all series, for SJCAM, forXiaoYi. Specification Fangrui Product Features: 1.Made of quality aluminium alloy material, anti-deformation, anti-rust, sturdy. 2.Aluminum alloy ball socket, meet the requirements of highly accurate and durable. Smooth surface, will not scratch your equipment. 3.Lightweight, easy to carry and use. 4.Bottom for 1 or 4 screw, fit for most of camera equipment. Good accessory for photography enthusiasts. 5.Compatible for DJI OSMO ACTION Gopro all series, for SJCAM, forXiaoYi. Specifications: Material: Aluminum Alloy Weight: Approx. 26g Ball head diameter: Approx. 2.5cm or 1 inch Bottom 1 or 4 " screw  Packing List: 1xBall Bracket Base Mount 2xRubber Gasket Package List Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.