Ensure the use of compatible 3M™ and Versaflo™ Headgear for your 3M™ Products
Used on the 3M™ Welding Shields L-150 and L-151 and also in the 3M™ Combination Faceshields L-153, L-154, L-184 and L-185. This knob secures the cam mechanism which is attached to the headgear.