Item type: DoubleHelical FocuserCondition: 100% brand newMaterial: aluminium alloyWeight: Approx. 120gColor: As picture shownFocusing Stroke: Approx. 10mm/0.4inAccuracy of focusing: Approx. 0.05mmInterface: 1.25inches, inner M42*0.75mm thread1.25'' 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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1Made of quality aluminium alloy material, high strength, corrosion resistant, sturdy and durable. 2Lightweight and compact size, easy to carry and use. 3High precision double helical focuser for guider scope/finder scope Interface. 4The solution for telescopes or telephoto lenses with sluggish focusing. 5Wonderful accessory for astronomical telescope.