This standard 2x 1.25" Barlow Lens from Stellarvue features full extreme broadband multi-coatings and is constructed using American-machined components. Both the insert tube (with safety groove) and eyepiece holder (with brass compression ring) are black anodized. A knurled stainless steel thumbscrew knob is optimal for those wearing gloves. For lower powered eyepieces, this Barlow provides twice the power while still maintaining its eye relief. This Barlow Lens does not have a filter thread as it would sensible to use the filter on the diagonal.