The Taylor truss rod wrench is a handy tool for making minor adjustments to relief in your the neck of your Taylor acoustic guitar. Use it to compensate for a change to heavier or lighter strings, or to dial in the right feel for your playing style. Features a ¼” nut driver on one end and a handy Phillips screwdriver on the other. Please note that the Nylon version is specifically designed to make adjustments to our older nylon-string models with truss rods that are accessed through the soundhole instead of at the peghead. The Universal version is compatible with all other guitars. Model #1316-09 for Universal and Model #1317-11 for Nylon.