Features 1、Exquisite and smooth appearance, its appearance is beautiful and textured, allowing you to enjoy the visual enjoyment during use. 2、Long service life, is anti corrosion and rust proof, durable and does not fade, has a high practicality, and can safely let you use it for a long time. 3、Simple to use, it is more convenient to disassemble and install, you can easily use it in combination with other optical instruments. 4、Independent research and development technology, it has high accuracy, good performance, and can be more widely used in the optical field. 5、Made of high quality aluminum alloy material, it has no burrs and pressure points, is not easy to deform, and has strong flexibility and stability. Specification Item Type: Diaphragm Model: SK44 Material: Aluminum Alloy Uses: Accessories for Lasers, Cameras and Optical Platforms Inner Hole Size: Approx. 2mm / 0.1in-44mm / 1.7in Outer Circle Size: Approx. 60mm / 2.4in Thickness: Approx. 6mm / 0.2in Number of Blades: 16 Package List 1 x Diaphragm