Description:Adjustable Iris diaphragm series is used in the optical system, it can provide different diameters to meet different requirements of light.Adjusting the handle to change the aperture diameter.High Quality: Using high quality iron material, anti corrosion, durable and reliable performance.Durable: without burrs and pressure points, the product is not deformed,exquisite and smooth. Wide Application:The microscope iris aperture adapter is very suitable for optical applications, it can be an accessory , camera, and optical platform.Size Chart:Diameter: 1.5-23mm/0.06-0.91inchOuter diameter: 37mm/1.45inchInner diameter:25mm/0.98inchThickness: 5.5mm/0.21inchBlades quantity: 14 PiecesPackage Includes:1x Iris Diaphragm