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【Quality Materials】7" Double Ball Aluminum Alloy Extension Arm is made of aircraft-grade aluminum alloy with hard oxidation treatment to resist corrosion in the high seas. The skeletal design makes it lighter and less resistant when used underwater, making the camera equipment easier to operate and control, making it the ideal diving equipment for underwater photography. 【Compatibility】Length: 7''/17.8cm; Ball Size: 1"/25mm; Weight: 2.39oz/68g. Compatible with all arm systems with a ball head with a diameter of 25 mm/1 inch. It is possible to attach several diving devices (e.g. filling lamp, flotation arm, etc.) by extending the arm of the diving lamp. 【Stabilize】The 1 inch ball joint is equipped with a rubberized O-ring that prevents friction when the unit is attached and provides a stable and safe support for the lighting system, preventing the unit from moving or shaking during shooting, making it ideal for use during diving, snorkeling and other underwater activities that require lighting in order to capture clear and vivid images. 【Expansion at will】The double ball extension arm with butterfly clips can be fixed multidirectional to fix the flash or video light, and you can rotate 360 degrees to adjust the angle of the light to achieve the best lighting effect, so as to take the ideal photos you have in mind. 【Unique Design】Designed with 1/4 screw holes, through which you can install the accessories you need, such as installing a 1/4 movable ball head bracket, so that the double ball joint arm can be transformed into a triple ball head, you can decide on the use of these mounting bits according to your needs.