2 pcs. Useful Compact Acoustic Guitar Truss Rod High Strength Durable 420mm Bidirectional Electric Guitar Type Rod Truss Rod SteelSpecifications:What this guitar neck tension rod can offer is high strength and anti-deformation performance, so it can effectively straighten the guitar's neck. This guitar neck tension rod is worth buying for the reason that it has a two-way design, so it can help you adjust the neck of your guitar back and forth. Made of high-quality metallic material, it is sturdy and durable to use. The length of this product is 42cm, the width is 0.9cm, and the height is 0.9cm. Suitable for most guitars or repair. Item Name: Guitar Neck Tension RodMaterial: MetalColor: BlueFeatures: Anti-deformation, high strength, light weight Size details:42cm x 0.9cm x 0.9cm/16.54" x 0.35" x 0.35" (Approx.) Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. The color of the adhesive tape may be different. Package Included:2 x Guitar Neck Tension Rod1 x Key