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The Sea & Sea Sea Arm 7 Additional Arm attaches to a Sea Arm 7 Compact System to provide a second arm for mounting an additional external strobe on a camera's underwater housing. With dual arms for strobes, you'll be able to host plenty of light to capture that National Geographic cover.
The Sea Arm 7 Additional Arm features several ball joints for supremely flexible positioning. It includes all necessary hardware to mount the arm to the Sea Arm 7 Compact System.