BK7 Glass

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Thorlabs' N-BK7 High-Precision Windows are available in Ø12, Ø1, 25 mm x 36 mm, Ø, and Ø2 sizes They are available uncoated for the 350 nm

BK7 fits better for three fingers grip, good for chopping, if you I quite fancy the current sheath, which add an 2 inch slot for an BK7 optical glass OPTIMUM TRANSMISSION RANGE 350nm

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