Rectangular Refraction Glass Block, 125 x 65 x 18mm Length_74mm Machined to equal volume from

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Rectangular Refraction Glass Block, 125 x 65 x 18mm Length_74mm Machined to equal volume fromLong format 125 by 65 by 18mm glass rectangular refraction block, the longest working face in the line stretching beam travel for class front lateral displacement demos.