Welcome to our store! 1. Small apertures with varying diameters are integrated into the optical system to meet diverse light transmission requirements. 2. Adjust the aperture diameter using the handle. 3. Metal material ensures reliable performance and durability. 4. We offer 5 types of apertures to choose from, catering to different needs. 5. The compact and practical design ensures stable aperture operation. Item Type: Iris Diaphragm SK25: Enlarged Diameter: 1.5-25 mm Material: Metal Outer Diameter: 44 mm Inner Diameter: 25 mm Thickness: 8 mm 14 Blades SK23 Outer Diameter: 37 mm Minimum Aperture Diameter: ø1.5 mm Maximum Aperture Diameter: ø23 mm Material: Metal Thickness: 7.0 mm 12 Blades SK12 Outer Diameter: 19.8 mm Minimum Aperture: ø1 mm Maximum Aperture: ø12 mm Material: Metal Thickness: 5.0 mm 10 Blades SK8 Outer Diameter: 14.8 mm Minimum Aperture: ø0.8 mm Maximum Aperture: ø8 mm Material: Metal Thickness: 4.5 mm 8 Blades SK6 Outer Diameter: 13.0 mm Minimum Aperture: ø0.8 mm Maximum Aperture: ø6 mm Material: Metal Thickness: 6 mm 8 Blades 1 x Diaphragm