Premium optical glass (BK-7) ensures high transmittance in near ultraviolet, visible, and near infrared ranges. Precision-engineered with a focal length of 14mm and a diameter of 20mm for optimal optical performance. Exceptional surface accuracy of /4@632.8nm and thickness tolerance of ±0.05mm for reliable results in various applications. Durable and resistant to mild chemicals and U-V radiation, making it ideal for outdoor and laboratory use. Versatile devise suitable for lenses, prisms, and optical elements in scientific and educational environments.