This five function, double-ended wrench is for M1A/M14 rifles. One end has a gas cylinder lock wrench and the other end has an SEI gas lock front sight wrench. The inside of the wrench consist of two gas plug holders and one gas piston holder. Manufactured from high quality 3/8" thick aircraft grade 7075-T6 aluminum and hard coat anodized in black. MADE IN THE U.S.A.