Music Nomad MN232 Truss Rod Wrench 5/16 “.Especially when adjusting the truss rod of a guitar is the right tool of great importance. With its ergonomic handle and carbon steel construction, the Music Nomad Truss Rod Wrench ensures professional and comfortable operation. A special rubber cuff prevents the metal shaft from bumping against the wood of the top plate when turning . At the other end is a magnetic cross- slotted screwdriver for the Truss Rod Cover. 5/16 “nut, suitable eg for Gibson (R), PRS USA (R), Gretsch (R) and many others.