An easy and affordable Drop D Tuner. Use to quickly drop the big E string down to D, (perfect for D-A-D-G-A-D) or install elsewhere for an alternate string drop or raise. Works on 6 in line tuners as well as 3x3 tuners. Installs in minutes with no modifications to your guitar. Works on most Nut/Washer style tuning keys. Available in right handed or left handed models.