Threaded for standard 2" filters; Total length = 85mm, Extension provided is 50mm (1.96").
Self-centering extension tubes can be used in the event of the Focuser reaching its maximum upper limit. The extension tube will come in handy to get focus of a closer object.
Use this new helical compression mechanism to make a 1.25" Eyepiece along with a 2" to 1.25" adapter / convertor to fit the center of the optical axis as much as possible to get the most accurate images and colors.
2-inch barrel size, can be used with telescopes or telescopes with 2-inch size.
Manufactured with precision from high quality aluminum The inside has a matte black finish to reduce glare and interference from outside. 
With a thread for supporting 2 "standard filters.
MADE IN TAIWAN