Griffin Armament Griffin CAR Stock Wrench Black. Black oxide and oil dipped. Some finish irregularity is common to this industrial tool. The wrench allows installation of Griffin Muzzle devices Castle nuts on AR firearms Griffin Low Pro Rigid rails and interfaces with many Griffin Silencers for maintenance or configuring. This tool allows easy access to your favorite bottled beverage. 1/2 inch drive compatible. 5/8 inch and 3/4 inch open end wrenches. 3 prong CAR wrench geometry. Bottle opener. Specifications for Griffin Armament Griffin Armorers Wrench: Manufacturer: Griffin Armament Fabric/Material: 4140 Steel Color: Black Finish: Black Oxide Condition: New Handle Finish: Black Oxide Package Contents: Griffin Armament Griffin Armorers Wrench Griffin Armament GACART: Griffin CAR Stock Wrench Black