Nozzle, Compatible with Brand Lightning, Series Lightning, Compatible with Series Robotic Torch 550 AMP, Bore Diameter 1/2 in, Connection Type Threaded, Nozzle to Tip Relationship 1/8 in Recess, Nozzle Shape Tapered, Maximum Amperage 550 A, Material Copper, Duty Rating Heavy Duty, For Contact Tip Series 63, 65, For Gas Diffuser Number 63-3103, Welding Processes MIG Welding (GMAW), Current Range 250 A to 550 A, Application MIG Welding, Color Copper, For Use With Tweco Lightning