High-Quality Consumables/Accesories Kit with Heavy-Duty Tips for MIG Welding Guns Compatible with Lincoln/Magnum 300 & 400 and Tweco #3 & #4 GunsConsumables Kit includes: 2 x Series 24A Gas Nozzles + 10 x Series 14H Contact Tips + 2 x Model 52FN Gas Diffusers + 2 x Model 34A InsulatorSelect your Contact Tips Size: 0.023 (14H-23) 0.030 (14H-30) 0.035 (14H-35) 0.045 (14H-45) 0.052 (14H-52) 1/16 (14H-116) or 5/64 (14H-564)Select your Nozzles Size: 3/8 (24A-37) 1/2 (24A-50) 5/8 (24A-62) or 3/4 (24A-75) Select your accessories sizes from the menu options and check all the pictures with dimensions to make sure they will fit your MIG Gun.