Categories›Guitars›Graph Tech PRL 8721 B7 Ratio Electric Locking Machine Heads with mini contemporary button, 7-in-line, bass side, left, black
Updated 13 May 2026
| Brand | Graph Tech |
| Category | Guitars |
| Available at | 1 UK stores |
| 90-day avg | £161.00 |
Graph Tech
Graph Tech PRL 8721 B7 Ratio Electric Locking Machine Heads with mini contemporary button, 7-in-line, bass side, left, black
£163.00£171.00↓ 5% offFair Price
Cheapest at Bax · 1 store
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PRICE HISTORY
Current
£149
Change
-1.7%
Avg
£154
Low
£146
High
£160
Volatility
2.0%
PRODUCT DESCRIPTION
- The Graph Tech PRL-8721-B7 Ratio Electric Locking Machine Heads are designed for 7-string electric guitars with a 7-in-line configuration on the bass side (left). Each of the tuning mechanisms has a unique gear ratio, making the tuning process faster and more precise for each string. The mini contemporary knobs offer a modern design, while the locking mechanism with a thumbwheel holds the strings firmly in place. The machine heads are easy to install with the included InvisoMatch mounting plates that are compatible with existing screw holes.