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Right Angle Prism Triangular Prisms Optical K9 Glass for Precision Optical Instruments N-BK7 (K9) Components: Amazon.com: Industrial & Scientific
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BK7 (Schott) glass substrates 25.4mm x 25.4 mm x 0.5 mm, Surface Quality: (60/40) - BK7Glass252505S2optUS
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