MASTER GRADE AR15 CROWFOOT ARMORER’S WRENCHES: Now you can say I’ve got a wrench for that! No more rigging and adapting generic wrenches to complete your builds. Master-Fit 1/2″ Drive Crowfoot Wrenches are purpose built and specialized for precise fitment to confidently deliver torque to the most common MIL-SPEC assembly nuts. Titanium coated stainless steel construction provides tight tolerances for solid nut-gripping strength and enhanced no-slip tool control.