RAPH TECH - Ratio tuned locking machine heads - electric guitar. One turn equals one tone on every string. Diecast housing with hardened steel gears. Locking wheel for fast string changes. 12:1 - 39:1 gear ratios. Vintage, tulip shaped string locking buttons. Includes 4 different sets of Inviso- Match aluminium mounting plates for easy install- ation into most headstock styles. Singles. 3-a-side. Triple chrome plated. Packaged.