Tweco 1440-1003 Fabricator 251/281 MIG Gun Universal Conduit Liner for Aluminum Wire measures 0.035-3/64-inch x 15 feet. It has galvanized spring wire with nylon on the inside surface of the wire conduit and each wire conduit has a brass alloy machined stop on the back end. It is designed to be used with Professional Choice Series #3, #4, Spray Master MIG guns MS350 & MS450 and Eliminator Style MIG Guns ELC250, 350 & 450 and aluminum wire. The part number is stamped on the outside surface of the brass stop for easy identification. Features and specifications: Process: GMAW Wire Conduit Material: Galvanized MB Spring Wire With .007" (0,18mm) Nylon Wall Spring Wire Diameter: 0.054" (1,52mm) Welding Wire Diameter: 0.035" - 0.045" (0,9mm - 1,2mm) Overall Length: 16.5 feet (5.03m) Overall Diameter: 0.187" (4.75mm) I.D. Diameter: 0.065" (1.65mm).