Feature: 1. Adjustable Design: This product can be installed with threads M30 to M37, adjustable aperture 1.5 to 26mm/0.06 to 1.02in, and provides small holes of different diameters in optical systems to meet different light requirements. 2. Highly Stable: The diaphragm is lightweight and does not add extra weight to the optical system. It has high strength, rust prevention and stable performance. 3. Easy to Operate: This product is easy and fast to operate, and users only need to rotate the outer ring to change the aperture diameter. 4. Aluminum Alloy Material: This product is made of aluminum alloy material and adopts a compact and practical design, making it durable and not easily damaged, and can be used by users for a long time; 5. Widely Used: This adjustable aperture is suitable for cameras, microscopes, and other machines, which can help them work better. Specification: Item Type: Iris diaphragm Weight: 32.00g/1.13oz Material: Aluminum alloy Aperture Diameter: 1.5mm to 26mm/0.06 to 1.02in Application: Lens modification, etc. Package List: 1 x Iris Diaphragm