Nozzle Compatible with Brand Lightning Series Lightning Compatible with Series Robotic Torch 550 AMP Bore Diameter 1/2 in Nozzle to Tip Relationship 1/8 in Recess Nozzle Shape Bottleneck Maximum Amperage 550 A Material Brass Duty Rating Heavy Duty For Contact Tip Series 63 65 For Gas Diffuser Number B 63-3103-2 Welding Processes MIG Welding (GMAW) Current Range 250 A to 550 A Application MIG Welding Color Brass For Use With Tweco Lightning Inside Diameter 0.5 in