The W1246-NG4 101.6 mm dia × 2.1 mm thick optical glass wafer is precision-manufactured from SCHOTT NG4 neutral-density glass, offering nearly uniform light attenuation across the visible spectrum with excellent optical flatness and surface quality. With a tightly controlled diameter, 90 mm clear aperture, fine edge finish, and high cosmetic standard, this wafer is ideal for imaging, metrology, and machine-vision systems or any optical application where consistent attenuation and dimensional stability are critical.