Features: Experience comfort and relaxation with our eyepiece cover. It provide a soft and comfortable fit without pressure on your eyes. Used in conjunction with opticals , it can relieve eye fatigue by blocking glarings and enhancing weak light, and improve attention to the targetings by eliminating the interferences of surrounding movement. Eyepiece cover reduce impacting, and better protects your eyes. To Help create the perfect distance between eye and the reaches. Suitable for stereo Microscopes, wide angled Microscopes eyepiece, and for eyepiece of the Microscopes and and other lens, and more. Specifications: Material:ABS Inner Diameter:28mm,33.5mm,30mm,32mm,33,37mm Package Includes: 1Piece Eyepiece Cover note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.