Features 1、Made of high quality aluminum alloy, no burrs and pressure points, the product is not deformed, and has strong flexibility and stability. 2、The product is exquisite, smooth, anti corrosion, durable, and does not fade, and it is more convenient to disassemble and install. 3、Compact and practical design, has good performance and high accuracy, and is widely used in lasers, cameras, and optical platforms. 4、The inner hole size of the product is adjustable to meet different light transmission requirements, and can change the diameter of the aperture by the handle. 5、This microscope adjustable aperture can be used in the laboratory, which can adjust the aperture to observe different objects. Specification Item Type: Aperture Material: Aluminum alloy Application: Accessories for lasers, cameras, and optical platforms Outer Circle Size: Approx. 15mm / 0.6in Inner Hole Size: Approx. 1-8mm / 0.04-0.31in (adjustable) Thickness: Approx. 4.5mm / 0.2in Number of Blade: 8 Package List 1 x Aperture