Allparts 5/16 inch Truss Rod Wrench

5/16 inch Box Truss Rod Wrench, suitable for many Gibson guitars. With Phillips Head Screwdriver on End. Socket length ~.375" 
Outside diameter of the socket is 11.05 mm. The distance from the top of the tool's arm to the end of the socket is 12 mm. Use these measurements to determine if this tool will reach your truss rod nut.