<ul><li>AM023(1.5-23mm): Outer diameter: 37mm. Inner diameter: 23mm. Thickness:7.1mm. Minimum aperture: 1.5mm. Maximum aperture: 23mm.</li><li>AM023-S(1.5-23mm with M4 bracket): Outer diameter: 44mm. Inner diameter: 23mm. Thickness:8mm. Minimum aperture: 1.5mm. Maximum aperture: 23mm.</li><li>Professional and practical design with beautiful appearance, easy to carry and use.</li><li>Usually used in laboratories, schools, teachers, sample observation, eyepiece protection, etc.</li></ul> Parameter: AM023(1.5-23mm): 1) Outer diameter: 37mm. 2) Inner diameter: 23mm. 3) Thickness:7.1mm. 4) Minimum aperture: 1.5mm. 5) Maximum aperture: 23mm. 6) Number of blades: 12pcs. 7) Lever length: 10mm. AM023-S(1.5-23mm with M4 bracket): 1) Outer diameter: 44mm. 2) Inner diameter: 23mm. 3) Thickness:8mm. 4) Minimum aperture: 1.5mm. 5) Maximum aperture: 23mm. 6) Number of blades: 12pcs. 7) Lever length: 10mm. Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.

Microscope Accessories Kit Adjustable Aperture Variable Optical 1.5-23mm Mechanical Iris Diaphragm Camera Condenser with Manual M4 Bracket Microscope Slides(Color:1.5-23mm 1pcs)