Item was made by Full metal; The double helical focuser is M31x0.5 male thread and 1.25 inch accessory collar with M42x0.75 male T thread flange; Accesory collar thumbscrews that you can install StarShoot AutoGuider or 1.25 inch eyepiece
Upgrade your R/P focuser by adding it to the end of the R/P focuser by using Alstar M42X0.75 Female to M42X0.75 Female Thread Telescope Adapter 9 mm; Note: please make sure that there is M42X0.75 male thread on your R/P focuser
Standard 1.25 Inch Barrel and Thread: Compatible with any telescope equipped with 1.25 inch focuser and the 1.25 inch female thread can also be connected with 1.25 inch telescope filter or other 1.25 inch telescope accessories; Whether for planetary observation or deepsky exploration this eyepiece delivers sharp and clear images meeting your high standards for stargazing
Multi-coated Lense Design: Each eyepiece has 5 lens elements in 3 groups; Experienced observers will appreciate at significant magnifications; Exceptional at nearly eliminating lateral color aberration