1Adjustable Design: This product can be installed with threads M30 to M37, adjustable aperture 5 to 26mm/0.06 to 02in, and provides small holes of different diameters in optical systems to meet different light requirements. 2Highly Stable: The diaphragm is lightweight and does not add extra weight to the optical system. It has high strength, rust prevention and stable performance. 3Easy to Operate: This product is easy and fast to operate, and users only need to rotate the outer ring to change the aperture diameter. 4Aluminum 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; 5Widely Used: This adjustable aperture is suitable for cameras, microscopes, and other machines, which can help them work better.1 x Iris Diaphragm