Feature: 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. Specification: Item Type: 2‑44mm Adjustable Iris Aperture Weight: 46g/1.6oz Material: Aluminum alloy Hole Diameter: 2mm-44mm. Package List: 1 x Adjustable Iris Aperture 1 x Packaging Box