Century Pro Grip™ Welding extension cords are designed for use with portable welding machines rated at 400 amps or less. Our heavy duty, hard service STW jackets are designed to remain flexible and pliable under full load. These cords feature lighted NEMA 6-50 ends that indicate the cord has power. The plug features Century’s convenient heavy duty Pro Grip handle that folds out of the way when not in use.