Item Type: Lens Diaphragm_x000D_ Material: Aluminum _x000D_ Weight: Approx. 9g / 0.3oz_x000D_ Hole Inner Diameter: 1-18.9mm 1EASY INSTALLATION: The manual adjustable lens diaphragm is easy to use, easier to disassemble and install, which can eliminate the tedious installation steps. Suitable for all kinds of optical instruments, cameras, etc. 2APERTURE ADJUSTABLE: Aperture diameter can be changed by handle.1?18.9mm adjustable aperture can meet different light transmission requirements. 10 blades are easy to adjust, making the aperture work more stable. 3PRACTICAL AND STABLE: The aperture diaphragm is an indispensable accessory for microscopes, cameras and optical equipment, very practical. 4MATERIAL: The adjustable aperture diaphragm is made of aluminum alloy, no pressure points, the product is not deformed, bring you a good using experience. 5DURABLE: The iris diaphragm has a delicate design and smooth, burr free surface, which is not only wear proof but also durable, with a long service life and can be used repeatedly over a long period of time.1 x_x000D_ _x000D_ LensDiaphragm