ARK Steel Tube Small Diameter Stainless Steel Tube Description: Product Name Small Diameter Stainless Steel Tube ASTM A312 TP304 TP321 � Seamless Tube Steel Grade TP304, TP304L, TP316, TP316L, TP321, TP247H, etc. Size range OD: 3.2-25.4MM WT: 0.2-2.5MM L: In straight length or In coil. Application Automotive Industry:� Engine, Transmission, Brake &� Fuel Chassis Systems. Power train Systems. Fluid Systems, etc. Aircraft/Aerospace: Fluid Transfer Lines, Fire Suppression Systems, Satellite Guidance Systems, Heat Exchangers, etc. Electrical: Electrical Fittings, Connectors, etc. Industrial: Flow Control, Pressure Control, Gauge Systems, Automation Controls, etc.