Martin Two Way Truss Rod Wrench

"The two way truss rod wrench can be used on both the two way adjustable rod necks or single adjustable rod. L-shaped 5mm allen wrench with ball end on long leg of L. Long leg approx 5-3/4"long, short leg approx 2-5/8". Damage done by mis-using the truss rod wrench is not covered by the Martin warranty."