The Forney 57902 3/8-Inch Red Male Sure-Grip Plug is used on Forney welders and Forney 52841, bumper jumper and or in conjunction with Forney 57701, 3/8-Inch female Sure-Grip plug or 57510, female output jack. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs. 3/8-Inch (9.52mm) red Sure-Grip plug. Proof of purchase required. neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.