Meade 2" 2X Barlow Lens #608004. Fully-Multi coated with 2 optical elements. Contains Aluminum housing with 30mm aperture. This Barlow Lens fits 2 inch filters and includes brass non-marring compressing ring for 2" to 1.25" Adapter. Insert this into the telescope's eyepiece holder first, and then insert your eyepiece into the Barlow. Product carries full one year Meade limited factory warranty.