Feature:1. 2mm to 44mm Adjustable: Adjustable hole inner diameter 244mm, outer diameter is 60mm, thickness of 6mm, 16 blades, in the optical system to provide different diameter holes to meet different light needs.2. Simple Operation: Just rotate the outer ring to change the aperture diameter, simple operation, direct adjustment. The compact and practical design makes the diaphragm a more practical way of working.3. Highly Stable: The diaphragm is lightweight, does not add extra weight to the optical system, high strength, rustproof, and very stable.4. Wide Range of Applications: This adjustable aperture is suitable for cameras, microscopes and other machines, which can help them work better.5. Reliable Aluminum Alloy Material: Aluminum alloy material, strong and durable, very reliable performance, long service life.Specification:Item Type: 244mm Adjustable Iris ApertureWeight: 46g/1.6ozMaterial: Aluminum alloyHole Diameter: 2mm-44mm.Package List:1 x Adjustable Iris Aperture 1 x Packaging Box