Feature: 1. Long service life, not easy to rust, good hardness, high strength, corrosion resistance, low density and easy operation. 2. It is manufactured with accurate craftsmanship, and high quality aluminum alloy material ensures its reliability and durability. 3. The adjustable diaphragm is highly adaptable and can be adapted to a variety of optical instruments, cameras, etc. 4. Small holes of different diameters can be provided in the optical system to meet different light transmission requirements. 5. Small size, light weight, compact structure, convenient and practical, make the diaphragm work more stable. Specification: Item Type: Iris Aperture Model: SK17 Material: Aluminum Alloy Uses: optical instruments such as laser cameras Outer Circle Size: Approx. 32.5mm / 1.3in Inner Hole Size: Approx. 17mm / 0.7in Thickness: Approx. 6mm / 0.2in Number of Blade: 7. Package List: 1 x Iris Aperture Note: Please pay attention to the incisive edges of the blades, pay attention to safety when using, and do not put your hands on the blades.