This Firepower 1441-0050 Clear Polycarbonate Cover/Safety Plate measures 5-1/4" x 4-1/2". For use as a component of welding goggles or helmets, it functions as either cover or safety plate and eliminates the accidental use of a cover plate in instances where a safety plate is necessary. It exceeds the high velocity and high impact requirements of the ANSI Z87.1-1989 and Canadian CSA Z94.3 Standards.