Forney 57511 Output Jack with Washer Brass Plug, Red Knob Female arc welder output jack with solid brass plug and screw, retainer nut and fiber washer Beveled for a secure connection Use on C, CB, FS and F series Forney welders and Forney 52841, bumper jumper For use with Forney 57901 and 57902, male sure-grip plug Red-fits No.1/0-No.4 welding cable