Baader Plug

2" ultra-hard receptacle with Safety-Kerf locking grooves. 32 mm total length, 27 mm remaining usable length (when screwed in). 2" SC (50.8 mm) external thread on the focuser side - and M48 filter thread on the inside (this receptacle is the only one that can accept a 2" filter on both the front and focuser side). 2" insertion diameter on the telescope side, also with 48 mm filter thread. 47 mm free inner diameter - with deep black coated anti-reflective grooves. Suitable, for example, for attaching the Baader 6x6 T-adapter (T-2 component #17) to 2" focusers - or as a secure, tilt-free "nose piece" for all 2" Baader zenith mirrors/zenith prisms.