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8mm L 4mm H Flat Plano Concave Cylinder Lenses Cylindrical Lens with K9 N-Bk7 Glass, Find Details and Price about Bk7 Plano Concave Cylindrical Glass Bk7 Concave Cylindrical from 8mm L 4mm H Flat Plano Concave Cylinder Lenses Cylindrical Lens with K9 N-Bk7 Glass - Hanzhong Borisun Optics Co., Ltd.