Categories›Guitars›Graph Tech PRL 8521 C7 Ratio Electric Locking Machine Heads with Contemporary knob - 7-String, 4 + 3 - Chrome
Updated 10 May 2026
| Brand | Graph Tech |
| Category | Guitars |
| Available at | 1 UK stores |
| 90-day avg | £164.50 |
Graph Tech
Graph Tech PRL 8521 C7 Ratio Electric Locking Machine Heads with Contemporary knob - 7-String, 4 + 3 - Chrome
£164.00£192.00↓ 15% offFair Price
Cheapest at Bax · 1 store
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PRICE HISTORY
Current
£155
Change
+5.5%
Avg
£149
Low
£137
High
£161
Volatility
4.9%
PRODUCT DESCRIPTION
- The Graph Tech PRL-8521-C7 Ratio Electric Locking Machine Heads are designed for 7-string electric guitars with a 4 + 3 configuration. Each tuning knob has a specific gear ratio, providing faster and more accurate tuning. The knobs feature a thumbwheel system that allows you to lock the strings for extra stability. With their chrome finish and modern knob style, they perfectly match any guitar. This set includes 7 tuning heads with 4 on the left and 3 on the right, including mounting plates for easy installation.