Item Type: Aperture_x000D_ Material: Aluminum alloy_x000D_ Application: Accessories for lasers, cameras, and optical platforms_x000D_ Outer Circle Size: Approx. 15mm / 0.6in_x000D_ Inner Hole Size: Approx. 1-8mm / 0.04-0.31in (adjustable)_x000D_ Thickness: Approx. 4.5mm / 0.2in_x000D_ Number of Blade: 8 1Made of high quality aluminum alloy, no burrs and pressure points, the product is not deformed, and has strong flexibility and stability. 2The product is exquisite, smooth, anti corrosion, durable, and does not fade, and it is more convenient to disassemble and install. 3Compact and practical design, has good performance and high accuracy, and is widely used in lasers, cameras, and optical platforms. 4The 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. 5This microscope adjustable aperture can be used in the laboratory, which can adjust the aperture to observe different objects.1 x Aperture