Features High-Accuracy Measurement Tool: This VU meter header delivers precise readings, ensuring optimal performance for your audio equipment and enhancing sound quality User-Friendly Pointer Dial: The intuitive design allows for easy interpretation of measurements, making it an essential tool for both beginners and professionals Durable Construction: Made from high-quality, wear-resistant materials, this DB amplifier header is built to withstand regular use, ensuring longevity and reliability Nighttime Visibility: Featuring a bright orange 12V 55mA bulb, this device provides clear visibility in low-light conditions, enabling accurate monitoring at any time Versatile Application: Ideal for DIY projects, recording studios, and car audio transformations, this testing tool adapts to various setups, making it a must-have for audio enthusiasts Features: 1、Provide small holes of different diameters in the optical system to meet different light transmission requirements. 2、The compact and practical structure makes the diaphragm work more stable, light in weight and easy to operate. 3、It is manufactured with craftsmanship, with , long service life, high strength and good durability. 4、The inner hole enlargement and reduction range is 1.5？34mm, which can meet your needs and adapt to a variety of optical instruments, cameras, etc. 5、The material is made of aluminum alloy, which is not easy to , has good hardn, resistance, low density, reliable and . Specification: Item Type: Iris Aperture Material: Aluminum Alloy Color: As shown in the picture Model: SK34 Outer Diameter Size: Approx.49mm / 1.93in Inner Hole Size: Approx.1.5-34mm / 0.06-1.34in Thickn: Approx.5.6mm / 0.22in Application: Optical instruments such as lasering cameras Package List: 1 x Iris Aperture Note: betweendiv>1. Please allow 1？2in error due to manual measurement. Thanks for your understanding.between/div>betweendiv>2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.between/div>betweendiv>3. Please pay attention to the incisive edges of the blades, pay attention to safety when using, and do not put your hands on the blades.between/div> Package List 1 x Iris Aperture