Item Type: Lens Diaphragm <br>Material: Aluminum Alloy <br>Model: SK60 <br>Uses: Optical Instruments <br>Basic Parameters: <br>Inner Hole Size: Approx. 4-60mm / 0.2-2.4in <br>Outer Circle Size: Approx. 82mm / 3.2in <br>Thickness Size: Approx. 8mm / 0.3in <br>Number of Blades: 18<br>1、4-60mm adjustable aperture to meet different light transmission requirements. <br>2、Easy to install, adapt to a variety of optical instruments, cameras, etc. <br>3、With 18 blades, it is easy to adjust and make the diaphragm work more stable. <br>4、Selected high?quality aluminum alloy materials, strong and durable to use. <br>5、Exquisite processing and manufacturing, stable and reliable performance.1. Please allow 0?1 inch error due to manual measurement. Thanks for your understanding. <br>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.1 x Lens Diaphragm