JL Billet Crows Foot 3/8 inch Drive 1-1/8inch Opening Black. If you're purchasing a 5.56 free float handguard and need to torque the barrel nut without braking the bank these are what you are looking for. We machine these out of 4130 Chromoly and Nitride coat them for corrosion resistance. Specifications for JL Billet Crows Foot 3/8 inch Drive: Manufacturer: JL Billet Fabric/Material: 4130 Chromoly Steel Color: Black Country of Origin: USA Finish: Black Nitride Gun Type: Rifle Features of JL Billet Crows Foot 3/8 inch Drive 556/ AR15 barrel nut crows foot 1 1/8 opening with 3/8 drive Package Contents: JL Billet Crows Foot 3/8 inch Drive What firearm models does the manufacturer say JL Billet Crows Foot 3/8 inch Drive is compatible with? The manufacturer says that JL Billet Crows Foot 3/8 inch Drive is compatible with AR-15 AR-10JL Billet JLB-CF-1125: Crows Foot 3/8 inch Drive 1-1/8inch Opening Black