Baader
Extension tube Fine adjustment ring for M48 1.0mm
$ 7.90
ready for shipping in 1-2
weeks
Baader
Extension tube Fine-Adjustment Rings T2 1mm
$ 7.90
ready for shipping in 1-2
weeks
TS Optics
Extension tube Fine Tuning Ring for T2-thread - thickness 1.0mm
$ 10.90
ready for shipping in 3-7
days