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Graphtech RATIO Electric Locking 3+4 Mini Contemporary Black 2 Pin PRL-8621-B7

Graphtech RATIO Electric Locking 3+4 Mini Contemporary Black 2 Pin PRL-8621-B7

Regular price ₱8,250.00 PHP
Regular price ₱0.00 PHP Sale price ₱8,250.00 PHP
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A right handed set of Locking Ratio Tuned Machine Heads for electric guitar that use 3+4 per side tuners. Fits many Gibson, Epiphone style guitars and a lot of acoustic guitars if you want to upgrade to a locking set of machine heads. A two pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. You can upgrade to the matching finish InvisoMatch Plates.

Ratio - Tuned Machine Heads incorporate different string gauges into the tuning equation. From Low B to High E 48:1, 39:1, 24:1, 20:1, 35:1, 20:1, 12:1. We balanced the gear ratios to each string simplifying the tuning process. With Ratio, a half turn is a semi-tone! Every string reacts the same to any tuning adjustment. Predictable, precise tuning on every string.

Standard Machine Heads - Installation Guide
Standard Machine Heads - Actual Size Template & Dimensions

InvisoMatch Mounting Plates - Actual Size & Dimensions



We've tuned the gear ratios to each string position so that every string responds the same to any tuning adjustment. You get fine tuning on the thicker core strings and coarser tuning on the thinner core; anywhere from 12:1 to 39:1 gear ratio. With Ratio¨, one turn is about one tone change on all strings, making tuning, retuning and open tunings easier, quicker and more intuitive.


Ratio¨ tuning feels natural. You don't have to think about which string you are tuning because they all feel and respond the same. No more overshooting the Low E or G. No more twisting away on the High E or D string. Open tunings have never been easier. String gauges such as light top, heavy bottom are no problem with Ratio¨; they still do the same precision tuning.


Ratio is more than just another entry into the machine head market. Instead, Ratio has reinvented how machine heads function with the musician.

Installation Video


We ship via Lalamove within Metro Manila or nearby cities. We ship via LBC, J&T, YTO, 2GO nationwide. You may select the courier upon checkout.

Care Instructions

Bring your guitar only to certified Guitar Pusher techs or to certified tech partners nationwide. Damage due to uncertified techs will not be honored for warranty claim.

When returning items, it should be in brand new condition without any modifications, complete with all accessories and attachments.

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  • Free Shipping

    We offer free shipping for total bill of P10,000 and above within Metro Manila and P25,000 and above for provincial shipments.

  • Hassle-Free Exchanges

    We accept 7-days exchange warranty for any factory defect. Just visit the branch where you bought the item, or send us a message in our Facebook page to schedule the exchange. Items must be in brand new condition.