The truss rod wrench is made of quality metal, fine workmanship, smooth surface and high gloss, fits for Taylor guitar. There is a nut screwdriver at one end and a convenient Phillips screwdriver at the other end. 7mm inner dimension nut screwdrive for truss rod adjustment, and Phillips screwdrive for removing screws from the cover. Oversize: 8.2x3x1cm(3.23"x1.18"x0.39")(LxWxOD), Length of handler: 7.2cm(2.83"). Inner size: 7mm(0.27"). Depth of socket: 7mm(0.27")., Weight: 0.0771617917 Pounds, Manufacturer: LGEGE