Nozzle Compatible with Brand Lightning Series Lightning Compatible with Series Robotic Torch 550 AMP Bore Diameter 3/4 in 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 Inside Diameter 0.75 in