Graph Tech 6-in-line Staggered Electric Locking Machine Heads | Black

The PRL-9721-B are precision-engineered locking machine heads designed for 6-in-line electric guitars. Featuring staggered posts, they eliminate the need for a string tree, ensuring smoother tuning and enhanced string tension. Their two-pin casing allows direct installation or compatibility with Graph Tech’s patented InvisoMatch mounting plates, included in four brushed aluminum sets for quick, accurate fitting using existing screw holes. These tuners provide reliable tuning stability and streamlined installation tailored for left-handed players seeking professional-grade performance.

Gear ratio: unique for each string position – one turn-one tone
Peg holes diameter required: 13/32″ (10mm)
String post diameter: 0.236″ (6mm)
String post length to string hole: 0.827” (21mm) – 0.787″ (20mm) – 0.748″ (19mm)
Weight per single machine head: 0.083lbs (38g)
Weight per set of six: 0.496lbs (225g)
String diameter up to 72 gauge
Includes 6 machine heads, mounting screws and bushings
Includes complimentary 4 sets of aluminum mounting plates