- Precisely milled 2" to 1¼" Reducer for completing the Baader ClickLock system, inserted height only 9.5mm - Slight pressure on the ratchet lever causes extremely strong holding force through force transmission to the compression ring, but also easy release of the clamping - M48 filter thread on the front accepts all commercially available 2" eyepiece filters, Internal T-2 photo thread (M42x0.75) allows the complete reducer to be connected to (almost) any T-2 photo thread - Compression clamping ring made of thick-walled hard bronze, remains dimensionally stable even after many years of use without scratching the 1¼"-receptacle