1. Tail nail detachable, easy to install, do not use screws to fix, do not the guitar's sound and colorl. 2. The insertion and extraction force of plug about 3.5kg, it be different with different shape plug. 3. The installation only need to open a 12mm hole in the tail of the guitar, the tail nail and the nut break down, adjust the mounting height of the mounting nut can be installed. 4. This product is fully enclosed work space, shielding effect, copper material, transmission effect is good. Model: dual track Product Size: 55 x 15 x 15mm or 2.17inch x 0.59inch x 0.59inch Scope: guitar, acoustic guitar, pickups How it works: connect the pickup (EQ) through the terminal, 2.5 or 3.5 jack conversion socket connect 6.35 cable to reduce signal source to the audio. Colour:As Shown Material:Metal Package Contents: 1 x Output Jack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.