The 3M™ Versaflo™ M-Series Helmet Welding Knob and Pivot Kit is designed for use with 3M™ Versaflo™ M-Series Helmets. As a complete replacement of the welding knob and internal & external pivot joints for the 3M™ Versaflo™ M-Series Welding Shield M-153SG, these parts restore full shield mobility. Get back to peak operational efficiency with the 3M™ Versaflo™ M-Series Helmet Welding Knob and Pivot Kit.The 3M Versaflo M-Series Helmet Welding Knob and pivot kit includes a pivot socket-cam, pivot spring-clip, pivot support cam, welding knob, and pivot joint left & right assembly. When installed with the 3M Versaflo M-Series Welding Shield M-153SG, it allows the face shield to pivot when raised, lowered, and repositioned.