These replacement Mounting Brackets for the Innerzone 1 and FirePro-1971 EX-1 are fully NFPA compliant and carry a lifetime warranty against manufacturer's defects. These semi-permanent mounting brackets attach to the brim of nearly any structural fire helmet, no drilling required. Once installed, the easy-to-tighten thumb screws secure the goggle straps to the helmet, allowing the user to store the goggles on the front or rear of the helmet. Recommended for use on helmets without face shields.