With this adapter ring the length of the Octo-60 slide can be extended by 12mm. The advantage of these screwed rings is the higher stability compared to a plugged extension. The clamping ring of the Centerlock clamp is then inserted into this ring, and of course the rotatable clamp must also be screwed onto this extension. If several such adapters are used, the clamping ring and the clamp always come on the uppermost adapter.