Wilkinson WJN-01 EZ-LOK 6 Inline Guitar Tuners with large Schaller style button. Featuring Wilkinsons 'EZ-Lok' system, these tuners boast 2 string post holes drilled at 90 degrees from each other. Just pull the string through one hole real tight, wrap it 3/4 around the post, and then pull tight through the other hole. Tune to pitch, cut the string- DONE. These tuners let you choose the top or bottom hole first to change the angle, making your string changes as easy as pie!