1、0.5X stereo microscope assisted objective lens, effectively enlarged the field of view. 2、Significantly increase working distance up to 165mm. 3、Easy to attach on objective, just screw it on. 4、This lens comes with a 1-1/8 5、Double the magnification of original objectives, a very practical objective lens accessories. Features: 0.5X stereo microscope assisted objective lens, effectively enlarged the field of view. Significantly increase working distance up to 165mm. Easy to attach on objective, just screw it on. This lens comes with a 1-7/8" (48mm) mounting thread. Double the magnification of original objectives, a very practical objective lens accessories. Specification: Material: Metal, Aluminum alloy, Glass Lens Model: KP-0.5X Weight: 85g/3oz Magnification: 0.5X Stereoscopic microscope objective lens: 0.3 times Working Distance: 165mm Mounting Thread Size: 48mm/1.9inch Package List: 1* 0.5X Auxiliary Objective Lens