This Camera Tray Kit from Bigblue combines the GoPro camera tray kit with a double clip, giving you everything you need to mount your GoPro and an optional accessory (like a light) for underwater filming.
Bigblue Standard GoPro Camera Tray with Dual Grips
Improve balance and handling while capturing video beneath the surface with Bigblue's Standard GoPro Camera Tray with Dual Grips, which is designed to support your action camera and two video lights. The neoprene grips afford long-term comfort, and feature 1" ball mounts on top for the attachment of lighting arms via the required clamps. Additionally, the balls have O-rings that prevent slipping and allow the clamps to maintain a better hold with less force. Built for extreme durability, the tray base and handles are made from an aluminum alloy that has been anodized to resist corrosion.
Bigblue CLP-02 Double Clip
This Bigblue CLP-02 Double Clip is used to join together 2 components of the Bigblue 1" ball-joint arm system. The clip is constructed from T6061 grade aluminum and holds the sections in position without slipping. The ergonomic handle allows the clip to easily be tightened or loosened underwater, even while wearing heavy gloves.