PickGuideGuyker GK-07SP Locking Tuners Review: Is Their Best-Seller Worth It?
Guyker's best-seller isn't a pickguard or a knob set — it's the GK-07SP, a full set of locking tuning machine heads aimed at players upgrading a Gibson Les Paul, Fender Strat, Telecaster, SG, or similar 10mm-headstock guitar. Locking tuners are one of the more common first mods for players chasing faster string changes and better tuning stability, so we checked whether the spec sheet and policies back up the price.
The GK-07SP is a set of six locking machine heads with an 18:1 gear ratio, designed for a standard 10mm peg hole. Each tuner weighs about 39g (305g for the full set of six), uses a 6mm string post with a 1.8mm max string gauge and a 27mm string-thru hole center height, and mounts via a screw-in hex-head bushing. The set includes 6 machine heads, 6 threaded bushings, 6 mounting screws, and 6 ferrules — everything needed for a full installation without separate hardware purchases. Guyker states it's compatible with a wide range of Gibson Les Paul, Fender Strat/Telecaster, SG, and EPI-style electric or acoustic guitars with modern 10mm headstock holes. On-site, this exact product holds 4.59/5 from 189 reviews, and independently, Guyker's Trustpilot page shows 4.2/5 from 129 reviews with 73% five-star — a real, reasonably large sample that's broadly consistent between the two sources rather than wildly diverging.
Pros
- Full 6-piece set with all mounting hardware included (bushings, screws, ferrules) — no separate purchases needed
- Real 18:1 gear ratio matching established brands in this category, for meaningfully cheaper
- 1-year warranty with free replacement for quality-related issues, plus a 30-day hassle-free return
- Customs and import duties are included in the price for most destinations — no surprise fees at delivery for most buyers
- Consistent rating story across both on-site (4.59/5, 189 reviews) and independent Trustpilot (4.2/5, 129 reviews) sources
Cons
- 13% of Trustpilot reviews are 1-star, with some reviewers noting minor fitting issues on certain components
- US standard shipping is $5.99 unless your order reaches $59.99 for free shipping — this single set alone may not qualify
- Standard delivery runs 5-10 business days in the US, longer internationally (6-14 days depending on region)
- 1-year warranty is shorter than some established competitors' lifetime coverage
- Requires a 10mm peg hole — confirm your headstock's existing hole size before ordering, since it's not a universal fit for every guitar
Who It's For
Good For
- Players upgrading a Gibson Les Paul, Fender Strat/Tele, SG, or similar 10mm-headstock guitar to locking tuners
- Budget-conscious guitarists who want a full hardware set without buying bushings and screws separately
- Buyers who want to check a real, reasonably large review base before a guitar-modding purchase
Skip If
- Your guitar's peg holes aren't 10mm — confirm compatibility before ordering
- You want a lifetime warranty rather than 1-year coverage
- You need your order to arrive within a week and don't want to pay for expedited shipping
How It Compares: Guyker GK-07SP Locking Tuners vs Grover 406C Mini Locking Rotomatic Tuners
| Spec | Guyker GK-07SP Locking Tuners | Grover 406C Mini Locking Rotomatic Tuners |
|---|---|---|
| Price | $37.99 | ~$65 |
| Gear ratio | 18:1 | 18:1 |
| Set size | 6 tuners + full hardware | 6 tuners |
| Warranty | 1 year | Lifetime |
Both sets share the same 18:1 gear ratio that matters most for tuning precision, but Grover is an established name with decades of use on production guitars and backs it with a lifetime warranty — Guyker undercuts the price by nearly half with a 1-year warranty instead. If brand pedigree and lifetime coverage matter most, Grover is the safer bet; if you want the same core spec for less and are comfortable with a shorter warranty, Guyker is the value play.
See Grover 406C Mini Locking Rotomatic Tuners →
Verified Ratings
Key Specs
| Gear ratio | 1:18 |
| Peg hole | 10mm |
| Weight | 39g per piece / 305g per set of 6 |
| String post diameter | 6mm |
| Max string gauge | 1.8mm |
| String thru-hole center height | 27mm |
| Bushing type | Screw-in hex head |
| Warranty | 1 year, free replacement for quality issues |
| Returns | 30 days, hassle-free |
| Shipping | $5.99 under $59.99 (US), free above; 5-10 business days |
In The Box
- 6x Guitar machine heads
- 6x Threaded bushings
- 6x Mounting screws
- 6x Ferrules
Frequently Asked Questions
Will the GK-07SP fit my guitar?
It's designed for a standard 10mm peg hole, which covers a wide range of Gibson Les Paul, Fender Stratocaster/Telecaster, SG, and EPI-style electric and acoustic guitars. Measure your existing tuner peg holes before ordering, since it won't fit headstocks drilled for a different hole diameter without reaming.
Does the set include everything needed to install it?
Yes — each set ships with 6 machine heads, 6 threaded bushings, 6 mounting screws, and 6 ferrules, covering a full 6-in-line or 3+3 installation without needing to source separate hardware.
Verdict
The GK-07SP delivers a complete, real 18:1 locking tuner set with all the hardware needed for installation, backed by a 1-year warranty and a review base that holds up consistently across both on-site and independent sources. At $37.99 for a full 6-piece set, it undercuts established names in this category by a wide margin while matching their core gear ratio spec. The main things to confirm before buying are your guitar's peg-hole size (10mm) and whether you're comfortable with a 1-year warranty instead of the lifetime coverage some pricier competitors offer.