Item Type: Adjustable Aperture Diaphragm Material: Aluminum Weight: Approx. 12g / 0.4oz Hole Inner Diameter Diameter: 0.5-15mm / 0.02-0.59in Blade: 12 Pieces Package List 1 x Adjustable Aperture Diaphragm 1ADJUSTABLE: Aperture diameter can be changed by handle. 0.515mm adjustable aperture can meet different light transmission requirements. 12 blades are easy to adjust, making the aperture work more stable. 2REUSABLE: The manual aperture diaphragm is sturdy and durable, not easy to corrode, does not fade, has a long service life and can be used repeatedly for a long time. 3STABILITY: This adjustable aperture diaphragm is preferably made of aluminum alloy, no burrs, comfortable to use, the iris lens is not deformed, elastic and stable. 4WIDELY USED: This adjustable aperture diaphragm is suitable for cameras, microscopes and other machines, which can help them work better. 5EASY INSTALLATION: Manual adjustable aperture diaphragm is easy to use, easy to disassemble and install, no need for tedious installation steps.