<ul><li>Material : metal. Outside diameter: 53mm. Inner diameter: 33mm. Blades : 12pieces.</li><li>Thickness:6mm. Minimum aperture diameter: 1.5mm. Maximum aperture diameter:33mm. Quantity: 1PCS.</li><li>Professional and practical design with beautiful appearance, easy to carry and use.</li><li>Usually used in laboratories, schools, teachers, sample observation, eyepiece protection, etc.</li></ul><br><br>

Microscope Accessories Kit 1 PC Mechanical Adjustable Aperture 1.5-17mm Microscope Camera Microscope Slides