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Graph Tech PRL-8721-B0 Ratio 6 In-Line Electric Guitar Locking Machine Heads - Mini Contemporary Style/Black Finish Demo

Electric Guitar Tuners, 6 In-line, Contemporary Shape, Locking Mechanism, and Ratio Technology - Black

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Faster and More Accurate Tuning

Graph Tech Ratio Locking Tuners allow you to tune your guitar more quickly and accurately than conventional designs. Each tuner in the set sports a custom gear ratio that makes each machine head react the same — roughly one full turn per whole tone. Because each string reacts the same, not only is tuning a more pleasant experience, but nailing alternate tunings is a much faster process. Graph Tech's mission statement is "to improve your playing experience." And that's exactly what Graph Tech Ratio Locking Tuners deliver.

Graph Tech's Ratio technology

Though it's a simple idea, Graph Tech's Ratio technology completely changes the way you tune your guitar. All six tuners are outfitted with gear ratios that ensure you attain the same response from your wound low E string as you do your unwound high E. No matter what string you are tuning, you'll notice that one full turn of the tuner equates to roughly one whole tone pitch change. The Ratio technology makes nailing your pitch much easier and faster. And you'll love how fast it is to get to Drop D and other alternate tunings.

Easy installation with no drilling

One of the greatest benefits of the Ratio system is that each tuner installs onto your guitar's headstock without any drilling or other destructive procedures and are completely reversible. Graph Tech's InvisoMatch mounting plates ship with the tuners. The machine heads mount directly to those plates and aren't screwed into your instrument. As their name would suggest, the InvisoMatch mounting plates are completely hidden by the Ratio tuners to supply a sleek, low-profile look on any instrument.

Graph Tech

Graph Tech has made it their personal mission to supply the products that will make your instrument play better, sound better, and perform better. From the company's popular String Saver saddles to their TUSQ string nuts that can be found on countless manufacturers' guitars, the company's products are a mainstay in the guitar and bass industry. Just about every player at Sweetwater owns something created by Graph Tech, because — like their mission statement demands — they never fail to improve our playing experience.

Graph Tech Ratio Locking Tuner Set (PRL-8721-B0) Features:

  • Makes tuneups faster and easier
  • Great for alternate and dropped tunings
  • Each tuner reacts the same to the same amount of force
  • 1 turn equals approximately 1 whole tone
  • Locking tuner design ensures rock-solid tuning
  • Contemporary design looks great on modern guitars
  • InvisoMatch mounting plates allow quick mounting with no extra screw holes

What is Demo Gear?

At Sweetwater, we're so picky that what we call a "demo" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

What demo means to us is that we've had it out of the box, or maybe it was in a customer's hands for a few days and isn't "factory fresh" as a result. Every demo item we sell has Sweetwater's 2-year Total Confidence Coverage™ warranty, and has been tested and verified up to "new" specs by our factory-authorized technicians to make sure it's in perfect working order before we ship it to you.

When you buy a Demo item at Sweetwater, you get:
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Warranty Info

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Tech Specs

  • Intended Instrument: Guitar
  • Configuration: 6-Inline
  • Finish: Black
  • Locking: Yes
  • Gear Ratio: 39:1, 24:1, 20:1, 35:1, 20:1, 12:1
  • Peg Diameter: 0.234" (peg), 0.385" (9.7mm peg hole)
  • Manufacturer Part Number: PRL-8721-B0

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Customer Reviews

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Rated 4/5

6 in line Ratio locking tuners

I recently bought these to upgrade the tuners on my new MIM Strat. Once I got them installed(which was a breeze that requires no drilling thanks to the invisomatch plates) I learned quickly how much difference the ratio tuners make compared to other locking tuners I've used. The action is so smooth and the tuning stability is excellent. The black ones look awesome on my Strat but I'm leaving off one star for a reason: the tuners don't come with the invisomatch plates that will fit a Strat and you have to buy them separately. If they included those plates, this would absolutely be a five star review.
Rated 5/5

WOW

I put these tuners on a Jackson Kelly Jeff Loomis. They are incredible. With the locking nut locks taken off the guitars still holds tune. If you dont do crazy bends. Super smooth tuners built extremely well.
Rated 5/5

Great Tuners

I installed these Graph Tech tuners on a Squire 40th Anniversary Strat and I am more than happy with them. Excellent tuners, this guitar stays in tune consistently.
Music background: Playing and collecting guitars for 50+ years.
Rated 5/5

Direct fit!

I have a Fender telecaster special edition fmt hh and I prefer split or locking tuners. These are a direct drop in replacement. No shims. No drilling. They're built sturdy and are a breeze to install!
Rated 5/5

Quality product, check your fit

The tuners are well put together and work as intended. Very smooth action and the ratios are great.

One caveat, make sure you know how your installation will go. I had a classic tuner set up and needed to do a little bit of drilling and modification of the supplied brackets. It was a little more work than I expected but it worked out well.
Music background: Hobbyist
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