Feature: 1. Adjustable aperture diaphragm, widely used in microscopes, cameras, etc. 2. Easy to install and disassemble, meet different light transmission requirements. 3. Exquisite processing, stable performance, make the diaphragm work more stable. 4. Premium aluminum alloy materials, strong and durable, long service life. 5. Optical instrument accessories, excellent quality and strong practicability. Specification: Item Type: Lens Diaphragm Material: Aluminum Alloy Model: SK6 Uses: Optical Applications Basic Parameters: Inner Hole Size: Approx. 0.8-6mm / 0.03-0.24in Outer Circle Size: Approx. 13mm / 0.5in Thickness Size: Approx. 6mm / 0.2in Number of Blades: 8. Package List: 1 x Lens Diaphragm Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.