The truss rod wrench is made of quality metal. The long handle allows easier access to the truss rod cavity. It fits most (not all) Gibson guitars as well as other guitars that require a wrench. Features a nut driver on one end and a Phillips screwdriver on the other. Suitable for adjusting the amount of relief in the neck and compatible with electric guitar replacement parts. The 6.35mm (1/4 inch) model fits most Taylor acoustic guitar series (not applicable to Taylor's classical guitars). Please check the size data carefully—choosing the wrong length may result in the tool being too long to insert or too short to reach the truss rod. The 7mm model fits some Korean PRS, Jackson, Taylor, and Ibanez guitars. Choose based on your guitar’s actual specifications and pay attention to length options. The 8mm (5/16 inch) model fits some American-made Gibson and ESP electric guitars. Choose based on your guitar’s actual specifications and pay attention to length options. Color: Black Material: Iron Size: 6.35mm / 7mm / 8mm Package Includes: 3 x Guitar Truss Rod Wrenches Note: Light shooting and different displays may cause the color in the image to differ slightly from the actual item. Measurement may vary by ±1–3cm.