Round borosilicate glass tube, custom-sized at 77×5mm to meet your specific application needs. Engineered for precision and reliability in industrial sight glass assemblies, gauge systems, and specialized optical components. Borosilicate composition provides exceptional thermal resistance, mechanical strength, and chemical inertness. Ideal for high-temperature environments and demanding industrial applications requiring superior clarity and durability. Custom dimensions ensure perfect fit and optimal performance in your equipment. Contact us for bulk orders, technical specifications, or alternative sizing options.