The 3M Speedglas G5-01 Pivot Knob is a replacement spare part for use with the 3M Speedglas G5-01 Heavy-Duty Welding Helmet. If the original part becomes worn-out or damaged during use, this product can be used to swap it out and get back to your work. Don't let a broken component stop your progress — add the 3M Speedglas G5-01 Pivot Knob to your part kit.Welding is tough work — and it's hard on you and your equipment. If the 3M Speedglas G5-01 Pivot Knob on your 3M Speedglas G5-01 Heavy-Duty Welding Helmet becomes damaged or worn-out from use, don't worry. Reach for this replacement part and stay in the action.