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For rotatable mounting of slides or apertures in the lens and aperture holder for student experiments; Aperture with bars for holding slides or apertures and plug-in ring for fastening in the lens and aperture holderMaterial: Polyamide glass fiber reinforced, blackDimensions: 60 x 60 x 18 mmWeight: approx. 15 gadditionally recommended:P5310-2A Lens and aperture holder