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For rotatable positioning of the polarizing filters in the mount in the optical axis;Sturdy holder with mounting ring for the polarizing filters in the mount, with clear degree scale (5° graduation), the holder is inserted into the rider for the optical bench and can thus be fixed to the optical benchMaterial: Polyamide glass fiber reinforced, blackHeight of the optical axis: 58 mmDimensions: 90 x 25 x 98 mmMass: approx. 40 gadditionally recommended:P5310-1E Riding saddle for optical bench, SE