The D'Addario Auto-Trim Locking Tuning Machines are precision tuners that eliminate the need for multiple windings and automatically cut off the excess string during string changes. This eliminates the need for string clippers making string changes easy and fast. Simply insert sting, tighten clamp, and tune to pitch. The 18:1 ratio worm gear constructions ensures greater precision than standard tuners and ensure tuning stability even during the hardest playing. Includes 6 tuners and mounting hardware.

• High quality precision tuners that automatically cut excess string during string changes
• Individual string clamps securely hold the string in the tuning machine, avoiding the need for multiple wraps around the post
• Precise 18:1 gearing ratio for smooth, exact tuning with minimal string slippage - diameter of tuning post 0.375"
• 6 In-line, chrome
• A Ned Steinberger design