1. Made of quality aluminium alloy material, high strength, resistant, sturdy and durable.
2. Lightweight and compact size, easy to carry and use.
3. High precision double helical focuser for guider scope/finder scope Interface.
4. The solution for telescopes or telephoto lenses with sluggish focusing.
5. Wonderful accessory for astronomical telescope.

Specification:
Item type: Double Helical Focuser
Condition: 100% brand new
Material: aluminium alloy
Weight: Approx. 120g
Color: As picture shown
Focusing Stroke: Approx. 10mm/0.4in
Accuracy of focusing: Approx. 0.05mm
Interface: 1.25inches, inner M42*0.75mm thread
1.25'' helical focuser, 10mm focusing stroke, lightweight.
In the process of focusing, the inserted eyepiece or zenith, etc. keeps no rotation and only makes linear motion, which is conducive to observation and shooting.

packing list:
1 x Helical Focuser