Nozzle Compatible with Brand Lightning Series Lightning Compatible with Series Robotic Torch 550 AMP Bore Diameter 3/8 in Nozzle Shape Tapered Maximum Amperage 550 A Material Copper Duty Rating Heavy Duty For Contact Tip Series 403 63 For Gas Diffuser Number 63-3103-2 x 404-3 Welding Processes MIG Welding (GMAW) Current Range 300 A Application MIG Welding Color Copper For Use With Tweco Lightning Inside Diameter 0.375 in Outside Diameter 0.938 Overall Length 2 3/4 in