2 x Barlow multi-coated lens with T adapter.  It is all metal construction.  This is a very nice Barlow lens.  It is all metal construction.  You can use it to attach your camera t ring to your telescope.  You will need the proper t ring for your camera and that will screw on to this Barlow.  We have Cannon and Nikon T rings available.  Ships from U.S.A.