SKU TT-2000-0059 Category

6 pcs Graph Tech Locking machine head PRL-8721-B0 Black

1 253,00 kr price excl. tax

RATIO® patented gear technology
RATIO® – Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low E to High E 39:1, 24:1, 20:1, 35:1, 20:1, 12:1.

We balanced the gear ratios to each string simplifying the tuning process.

With RATIO®, a half turn is a semi-tone!

Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

15 in stock

Complete set of PRL-8721. 6 in-line

The PRL-8721  are a right-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitar that use 6-in-line tuners.

It has a two pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab].

4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes.

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: 0.910” (23mm)
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

RATIO® patented gear technology
RATIO® – Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low E to High E 39:1, 24:1, 20:1, 35:1, 20:1, 12:1.

We balanced the gear ratios to each string simplifying the tuning process.

With RATIO®, a half turn is a semi-tone!

Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

Dear friends of True Temperament.

We’re gearing up for production in Q4 and Q1 2026. Place your order with a 20% deposit to reserve your spot for a guitar, bass, or neck. The remaining balance is due before delivery, and we’ll email you your estimated delivery date.

Rock on!