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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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25mm 532nm 632.8nm Laser Plane Protection Window with K9 N-Bk7 Glass - China Laser Safety Window 1064nm, Laser Window | Made-in-China.com
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