VitroCom fabricates a complete line of high-quality Double and Four Bore Tubing in Borosilicate and Clear Fused Quartz that are excellent for thermocouples, electrochemical probes, and other insulating applications. Double and Four Bore – Glass Tubing may be modified to customer specifications and cut to specific lengths with specific end finishes using our templates below or submitting your own drawing. With over 50 years’ experience in glass fabrication, state-of-the-art equipment, and a highly qualified staff of Engineers and Technicians, VitroCom is ready to meet your most demanding requirements or simply order for our stock selections below.