Baader 2" ClickLock 2956257 clamp to S57a – for Celestron / SkywatcherBaader 2" ClickLock S57 clamp with ring dovetai for Celestron SkyWatcher Newtonian focusers A small rotation by 20 with gentle fingertip pressure to the knurled lever is enough to securely clamp every 2" accessory. Ratchet function features acoustic and haptic display of the clamp position. This way you can hear and feel in darkness without looking if the clamp is opened or closed. Compression tension ring of thick walled hard bronze, keeps its shape