This five function, double-ended wrench is for M1A/M14 and M1 Garand owners. One end has a gas cylinder lock wrench for M1A/M14 rifles and the other end has a gas cylinder lock wrench for M1 Garand rifles. 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 od green. MADE IN THE U.S.A.