The Double Handle Tray for Sea & Sea MDX-7D Housing from Beneath the Surface serves as the base for an underwater photography tray system. The tray has a long slot where the camera housing bolts through, so that the housing can be moved from the left to the right to make it more comfortable to operate the camera. This tray base has the capacity for 2 handles (not included). All trays have a pre drilled hole for a specially-made Beneath the Surface camera lanyard to attach to a buoyancy control device / BCD to prevent camera loss. This tray is for a Sea & Sea MDX-7D DSLR Underwater Housing for the Canon EOS 7D camera.