Baader 2" Clicklock Eyepiece Clamp for Standard SCT Threads - CLSC-2This Baader 2" Clicklock Eyepiece Clamp mounts directly to the standard rear cell threads on all popular SC telescopes. Once installed, simply insert a 2" eyepiece or other accessory and lightly twist the Clicklock's rubber knurled outer collar to lock it securely in place. To change out an eyepiece, just twist the outer collar in the opposite direction, remove the eyepiece, and insert a new one. It is super easy and fast! Amateur astronomers love the