Feature: 1. Aluminum Alloy Material: The lens diaphragm is made of premium aluminum alloy material, providing durability and a long lifespan. It can be used repeatedly for a long time, delivering a great user experience. 2. Adjustable Diaphragm: The microscope diaphragm adapter can change the diameter of the diaphragm through a handle. The adjustable diaphragm ranging from 3mm to 52mm meets different transparency requirements. With 14 blades for easy adjustment, ensuring stable diaphragm operation. 3. Practical and Stable: The camera diaphragm features a compact and practical design, with exquisite manufacturing craftsmanship, ensuring convenient and stable diaphragm operation with reliable performance. 4. Versatile Application: The lens diaphragm is versatile and compatible with various optical instruments and cameras, enhancing their performance and functionality. 5. Easy Installation: The manually adjustable lens optical diaphragm is easy to use and hassle free to install, saving you from complicated installation steps. Specification: Item Type: Lens Diaphragm Material: Aluminum alloy Weight: Approx. 66g/2.3oz Hole Inner Diameter: Approx. 3 to 52mm/0.1 to 2.0in. Package List: 1 x Lens Diaphragm1 x Storage Box