Gives you a ball mount on the camera’s tripod mount. The ball is permanently mounted, so it will not spin off.
You will need the fixing bolt from your camera  and a ULCS clamp and
ball on the top of your housing.

Features:

Model: NS029

Size: 66mm x 30.8mm

Material: Aviation aluminum alloy high quality silicone ring

Colour: Black

Process: Anti-seawater corrosion anode hard oxidation

Design: Standard ball head non-slip lock nut

Applicable: Camera, diving camera case and other accessories