Features With Adjustable Features: The inner hole size of the aperture module is 1.5-25mm, the outer diameter size is 37mm, and the thickness size is 5.5mm. Suitable for Optical Applications: The integrated aperture of the aperture module is suitable for optical applications, suitable for various optical instruments, cameras, etc. Light weight: The adjustable aperture is manufactured with precise technology, which has reliability and high precision, small size and light weight. Reliable and Durable: The adjustable aperture is made of selected aluminum alloy material, which is reliable and durable, and is a very practical accessory. Compact and Practical Design: The iris diaphragm has a compact and practical design, which makes the diaphragm work more stable and more convenient for us to use. Specification: Item Type: Iris Aperture Material: Aluminum Alloy Color: As shown in the picture Model: SK25 Inner Hole Size: Approx.1.5-25mm / 0.06-0.98in Outer Diameter Size: Approx.37mm / 1.46in Thickness: Approx.5.5mm / 0.22in Application: Optical applications Blades: 14 Package List: 1 x Iris Aperture Package List 1 x Iris Aperture