Mr.Power 5mm Ball End Allen Wrench For Guitar Truss Rod Adjustment<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> For USA Martin and most acoustic guitar </span></li><li><span class="a-list-item"> Two way L-shape truss rod adjusment </span></li><li><span class="a-list-item"> 5mm ball end </span></li><li><span class="a-list-item"> 12.5cm x 7.5cm </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31erN7wDw2L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41-ddTYCoiL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41EYZqpfqwL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41z-Xd-tgGL.jpg" noproxy>