Features Wide application, it is an accessory for laser, camera and optical platform. Compact and practical design makes the diaphragm more stable. Exquisite and smooth, no burrs and pressure points, the product will not deform. Using high quality iron material, anti-corrosion performance, durable and reliable. Professional manufacturing, stable characteristics, high reliability. Specification: Item type: iris diaphragm Material: Iron Colour: as shown in the picture. Model: SK7.5 Magnifying Diameter: about 0.5-7.5mm/0.02-0.30inch Outer diameter size: about 14mm/0.55inch Inner diameter: about 0.5-7.5mm/0.02-0.30inch Thickness: about 5.5mm/0.22inch Application: laser accessory, camera and optical platform. Blades: 8 Package List:1 x Iris Diaphragm Package List 1 x Iris Diaphragm