25-pcs premium quality 14H-series HEAVY DUTY contact tips for Tweco Lincoln MIG welding gun. Ideal replacement for Lincoln heavy duty contact tip KP14H series in Lincoln Magnum 200-400, Tweco Professional No.2/No.3/No.4 and SprayMaster series MIG welding guns, as well as many other specific MIG welding gun using Tweco 14H-series contact tips. Machined from a copper alloy tubing providing a consistent and smooth inside diameter surface. Each contact tip is marked showing wire diameter. Inside diameter tolerance is held to +/-.003". With excellent electrical properties ideal for use in standard welding application up to 400 Amp. Threaded style contact tip to ensure proper contact with a gas diffuser when installed to the MIG gun. Available tip sizes: 0.023" (14H-23), 0.030" (14H-30), 0.035" (14H-35), 0.040" (14H-40), 0.045" (14H-45), 0.052" (14H-52), 1/16" (14H-116) and 5/64" (14H-564). U.S. based welding and hardware supplier. Strong technical support with experienced customer service to address buyer's any question.