For use with only the UV3XL - This Lens Cartridge allows you to have individual cartridges pre-setup for all your disciplines of archery; 3D, Field, Indoor, Outdoor, etc… Installs into the UV3XL scope Please note; It will not fit the UV2 The cartridge is keyed ensuring your point of impact does not change when you swap it out This lens cartridge will hold both a lens and pin-ring at the same time (unlike the UV2 cartridge) The cartridge is constructed out of a high quality molded polymer core Does not come with a lens installed - must purchase a lens separately Accepts lenses with a diameter of 1.750"