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Industrial Heat-Resistant Pinhole Lens with Straight View. Adjustable Three-Variable Lens: Aperture, focal length (3.5-6mm), and focus are fully adjustable for clear imaging. High-Temperature Resistance: Made of stainless steel with a 1mm pinhole, designed for high-temperature furnace observation. Customizable Length: Available in standard lengths (330-1100mm) or fully customized to customer requirements. 18-Month Warranty: Comprehensive 18-month warranty coverage with repair and replace after-sales service. OEM/ODM Support: Full customization options including samples, designs, and flexible manufacturing services.