Features Adjustable Inner Diameter: Customize your light control with an inner diameter range of 4.5 to 25mm, ly suited for various optical needs Versatile Light Functionality: Achieve optimal light throughput with multiple small hole options, enhancing your photography and videography experience User-Friendly : Effortlessly adjust the diameter using a convenient handle, making it ideal for both seasoned photographers and beginners Features: 1、Adjustable Inner Diameter: The aperture diaphr has an adjustable inner diameter of 4.5 to 25mm, an outer diameter of 42mm, and a thread diameter of M36. 2、Function: The aperture diaphr provides small holes of different diameters in the optical system to meet different light throughput requirements. 3、Easy to Operate: Change the diameter of the aperture diaphr by the handle, very easy to operate in practice and friendly to novices. 4、Aluminum Alloy and Stainless Steel: The camera aperture diaphr is made of aluminum alloy and stainless steel for reliable performance and ruggedness. 5、Compact and Practical: This aperture diaphr uses a compact and practical design, making the aperture diaphr a more practical way to work. Specification: Item Type: Aperture Diaphr Material: Aluminum alloy, stainless steel Inner Hole Diameter: Approx. 4.5-25mm / 0.18-0.98in Outer Diameter: Approx. 42mm / 1.65in Number of Blades: 14 Thickness: Approx. 10mm / 0.39in Thread Diameter: M36 Package List: 1 x Aperture Diaphr Package List 1 x Aperture Diaphragm