Lincoln Electric KP2100-2B1 MIG Welder Nozzles, Tips & Insulators; Connection Type: Threaded ; For Use With: K126-1,-2 and K345-10; K126-1,-2 and K345-10 ; Tip Material: Copper ; Features: Innershield. Contact Tip - Severe Duty,1/16in(1.6mm),5/16in(7