Features Multi-Purpose Testing Tool: Ideal for various applications, these clips are perfect for electrical testing and circuit experiments, enhancing your versatility in the lab or field Exceptional Conductivity: Crafted from high-quality brass, these clips ensure excellent conductivity, providing reliable performance for extended use in all your electrical projects Safe and Reliable Design: Featuring insulated construction with weldable wire, these test clamps guarantee safety during operations, minimizing risks while you work Superior Specifications: Rated for 30A current and 1000V voltage, with a 20mm opening and 4mm rear hole diameter, these clips meet rigorous standards for professional use User-Friendly Operation: Easily connect to your test equipment and begin testing immediately, streamlining your workflow and boosting efficiency in your electrical tasks Features: 1、Long service life, not easy to , good hardn, high strength, resistance, low density and easy . 2、It is manufactured with accurate craftsmanship, and aluminum alloy material ensures its reliability and durability. 3、The adjustable diaphragm is highly adaptable and can be adapted to a variety of optical instruments, cameras, etc. 4、Small holes of different diameters can be provided in the optical system to meet different light transmission requirements. 5、Small size, light weight, compact structure, convenient and practical, make the diaphragm work more stable. Specification: Item Type: Iris Aperture Model: SK17 Material: Aluminum Alloy Uses: optical instruments such as laser cameras Outer Circle Size: Approx. 32.5mm / 1.3in Inner Hole Size: Approx. 17mm / 0.7in Thickn: Approx. 6mm / 0.2in Number of Blade: 7 Package List: 1 x Iris Aperture Note: 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. Package List 1 x Iris Aperture