We have tested the effectivity and stability of the ClickLock mechanism for many years with the 1¼" ClickLock clamp. The 2" ClickLock system is designed to be much more mechanically solid. Gone are the cumbersome thumbscrews and fumbling in the dark. Gone are imprecise and wobbly holders. Now, with a simple twist, 2" eyepieces and accessories are instantly locked with such strength that they can literally support an entire telescope without slippage. Simply grasp the rubber-knurled outer collar and lightly twist - that's all there is to it. Specifications SKU (#) 2956220 EAN CODE 4047825022455 NET WEIGHT (G) 170 OPTICAL LENGTH (MM) 47 CLAMPING SYSTEM ClickLock USAGE Fast Clamping of Every 2" Accessory INNER DIAMETER / CLEAR APERTURE (MM) 50,8 (2") OUTER DIAMETER 68 INNER CONNECTION (LENS SIDED) Thread, 2" (50,8mm) INNER CONNECTION (EYEPIECE/-CAMERA-SIDED) Clamp, 2" (50,8mm) COMPATIBLE BRANDS Baader Planetarium, Celestron, Zeiss TYPE OF ADAPTER ClickLock, Eyepiece Clamp