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Precisely molded PMMA convex lens with 95% light transmission and 1474 refractive index, which offers efficient beam focus for LED zoom flashlights and bike headlights. Available in 11 diameter options (0.394/0.591/0.709/0.787/0.906/0.984/1.102/1.142/1.181/1.260/1.378/38mm) to fit different Devise's housing; the boardboard/Step simplifies assembly and alignment. The wide working temperature range from -58 °F to 842 °F ensures stable optical performance in outdoor or high heat environments. Each lens is individually measured with a tolerance within 0.3mm, ensuring consistent fit and reliable optical alignment for DIY or replacement projects. Suitable for use with standard LED light sources; Compatible with standard flashlight bodies and bicycle lamp holders (no adhesive or frame included).