Truss Rods allow the curvature of the neck to be adjusted due to the natural “bows” or “warps” caused by string tension. Grover Truss Rod Adjusting Tools are made to fit the two most widely used truss rod sizes; 1/4″ and 5/16″. This item is an indispensable tool for all players.
(GP140 1/4″ size)
(GP150 5/16″ size)