7000 Series Reusable Half Mask Facepiece, Medium, Gases Particulates Vapors, Thermoplastic Elastomer no checkout and studs to prevent loosening and studs to prevent loosening due to vibration Works on all metals Designed for precision metal fasteners under 3 4" Protects threads from rust and corrosion Removable with hand tools compact design fits well under welding helmets and with safety glasses Mask drops down for convenient storage around the neck or locks down for custom fit Adjustable head cradle and curved neck buckles for extra comfort high tech look and increased worker acceptance Light weight design plus extra wide sealing area provides all day comfort Low profile