Iris Aperture Aperture Module Integrated Diaphragm Manually Adjustable 1.5mm To 26mm ID 45mm OD M30 To M37 For Optical System Camera Microscope

Materials: The aperture diaphragm is made of aluminum alloy and stainless steel, strong and sturdy, very in performance. Simple Just use the handle to change the aperture diaphragm diameter, which is easy to operate and more directly for adjustment.