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Lens barrel

It's a technique for narrowing small tubular bodies!

Material SUS304 and SUS316L, plate thickness t=0.04 mm. Outer diameter of the tube 0.47 mm, inner diameter of the tube 0.39 mm, maximum tube length 3.2 mm. The end of the tube has a round hole with a diameter of 0.35 mm, referred to as a "mirror tube." The photo on the left shows a mechanical pencil lead with a diameter of 0.3 mm. The photo on the right shows the material before it was narrowed.