1、2mm to 44mm Adjustable: Adjustable hole inner diameter 2‑44mm, 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.