Contact Tip, Compatible with Brand MK, Series 621, Compatible with Model Python, Cobramax, Prince XL, Cobra MX, Compatible with Series MK Products, Duty Rating Standard Duty, Maximum Wire Diameter 0.052 in, Connection Type Threaded, For Nozzle Series 621, Welding Processes MIG Welding (GMAW), Connection Thread Size 5/16 In.-18, Inside Diameter 0.06 in, Outside Diameter 0.375 in, Overall Length 1.57 in, Package Quantity 10