The OVL TwistLock Adapter is an innovative, low-profile, self-centering 2″ to 1.25″ telescope eyepiece adapter in a sturdy threaded metal construction for accommodating 2″ standard filters. Simply twist the upper, knurled mounting ring and your 1.25″ The eyepiece, camera adapter, or laser collimator is precisely centered in your 2″ focuser and secured by a polypropylene compression ring that prevents scratching or damaging the accessory. Standard 1.25″ adapters use a thumbscrew that compresses the accessory on one side when is tightened, not so this adapter. But wait, there’s more… if you unscrew the knurled mounting ring, you’ll find a male T2 thread underneath that accepts your camera or other accessory. (Adapter 2″ to T2). So you get 2 adapters for the price of one. You will definitely want one for each of your telescopes! Scope of delivery: adapter ring !Power supply and batteries are not included in the scope of delivery!