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Microscope Adjustable Aperture, SK6 SK8 SK12 SK23 SK25 Microscope Iris Adapter, Optical Diaphragm for Microscope(SK12) auspowers_batchone you can substitute other suitableMicroscope Adjustable Aperture, SK6 SK8 SK12 SK23 SK25 Microscope Iris Adapter, Optical Diaphragm for Microscope(SK12) Specification: Item Type: Iris DiaphragmSK6Outer Diameter: 13. 0mmMinimum Aperture: 0. 8mmMaximum Aperture: 6mmMaterial: MetalThickness: 6mm8 BladesPackage List: 1 x Diaphragm Product Features APPLICATION: Small apertures of different diameters are provided in the optical system to meet different light transmission requirements.