Crye Precision AirFrame Peltor Adaptor Set Sold as a pair Allows the 3M Peltor ARC Adapters to be made compatible with our AIRFRAME RAILS These adapters also maintain compatibility with existing ARC Rail geometry, and can be used interchangeably Simple installation replaces the original mounting hardware, allowing Peltor ear protection to be used with the AIRFRAME HELMET Authentic. Made in the USA.