PMMA Flat Convex Acrylic concentrate Lens for Zoom Flashlight Bike Head Lamp Light Spotlight(1PCx21.8mm)

【Precision Optical devise】Flat convex shape concentrates light beam for enhanced brightness and concentrate in zoom flashlights, bike head lamps, and spotlights. 【High-Transparency PMMA Material】Crafted from clear acrylic (PMMA) with excellent light transmission, ensuring minimal light loss and long-lasting durability. 【Multiple Size Options Available】Compatible with lens diameters: 10mm, 15mm, 18mm, 20mm, 23mm, 25mm, 28mm, 29mm, 30mm, 32mm, 33mm, 35mm, and 42mm. Please confirm your device size before purchase. 【Easy Replacement & Upgrade】devised as a direct replacement lens for zoom LED flashlights, bike lights, and lanterns. Simple installation without modification. 【Accurate Dimensions】Manual measurement with error within 0.3mm. Package includes 1 piece of lens. Note: This lens is not compatible with machine or high-heat applications.