Planet Waves' Auto-Trim tuning machines are precision-designed with built-in hardened steel-string cutters and individual string clamps are real time-savers. Their design cuts excess string while you tune, eliminating the need for extra tools. Individual string clamp securely holds string in tuner, so there is no need for multiple wraps around the tuning post. Rugged die-cast outer casing houses precision-machined 18:1 bevel and worm gears, providing smooth, exact tuning, while virtually eliminating backlash and slippage. The string clamp and cutting mechanism makes the chore of restringing a snap.