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        Model:49-4
        1. Material: Optical glass (high borosilicate, K9, BK7, BK270)
        2. Light transmission: 95% (97% after coating)
        3. Refractive index: 1.474
        4. Operating temperature: -50-500 degrees
        5. Size introduction: External diameter: 49mm, Height: 23.4mm, Steps: 3.5mm
        6. Light angle: 70°
        Model:50-21
        1. Material: Optical glass (high borosilicate, K9, BK7, BK270)
        2. Light transmission: 95% (97% after coating)
        3. Refractive index: 1.474
        4. Operating temperature: -50-500 degrees
        5. Size introduction: External: 49.5mm, Internal: 46.2mm, Height: 18.32mm, Steps: 2.5mm
        6. Light Angle:60°
        Model:50-49
        1. Material: Optical glass (high borosilicate, K9, BK7, BK270)
        2. Light transmission: 95% (97% after coating)
        3. Refractive index: 1.474
        4. Operating temperature: -50-500 degrees
        5. Size introduction: External diameter: 50mm, Internal: 48.5mm, Height: 28mm, Steps: 4mm
        6. Light angle: 40°
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