Radnor 14 Series Standard Duty Contact Tip accommodates 0.045" wire and is compatible with 200 - 400 A Radnor, Radnor Pro, Tweco, Tweco No. 2, Tweco No. 3 as well as Tweco No. 4 MIG guns. 1 1/2" Threaded style contact tip is machined from copper alloy tubing that gives a surface of consistent and smooth inside diameter. It provides proper contact with a gas diffuser when installed to the MIG gun and is ideal for use in standard welding application up to 400 A.