Categories›Guitars›Graph Tech PRL 8521 B7 Ratio Electric Locking Machine Heads with Contemporary knob - 7-String, 4 + 3 - Black
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 B7 Ratio Electric Locking Machine Heads with Contemporary knob - 7-String, 4 + 3 - Black
£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-B7 Ratio locking machine heads are ideal for 7-string electric guitars. With a sealed construction and a unique gear ratio for each string, they offer a fast and precise tuning experience. The InvisoMatch mounting plates allow you to use existing screw holes, making installation easy. The mini contemporary knobs provide a stylish look, and the black finish gives a modern look to your instrument.