Skip to product information
1 of 1

212 total reviews

4+2 Ratio Lefty Electric Locking Machine Heads Mini Contemporary Button (Black Finish) (PRL-8421-LB0)

4+2 Ratio Lefty Electric Locking Machine Heads Mini Contemporary Button (Black Finish) (PRL-8421-LB0)

PRL-8421-LB0

702725245093

Regular price $160.94 USD
Regular price Sale price $160.94 USD
Sale Sold out
Shipping calculated at checkout.
Select Finish
Select Button Style

RATIOĀ® patented gear technology
RATIOĀ® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low E to High E 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 RATIOĀ®, a half-turn is a semi-tone!

Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

RATIO Machine Heads explanation video

Ā 

The PRL-8421-LB0 is a left-handed set of Locking RATIOĀ® Calibrated Machine Heads for a Music Man, or other 4 x 2 style headstock.

It has a mini contemporary button.

It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab].

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.

Ā 

4x2 tuners setĀ Ratio Tuned Machine Heads: The New Standard In Tuning Technology

Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 13/32" (10mm)
String post diameter: 0.236" (6mm)
String post length to string hole: 0.910ā€ (23mm)
Weight per single machine head: 0.083lbs (38g)
Weight per set: 0.496lbs (225g)
String diameter up to 72 gauge
Includes 6 machine heads, mounting screws and bushings
Includes complimentary 4 sets of aluminum mounting plates

UPGRADE TO PREMIUM PLATED INVISOMATCH View full details
5.0
Rated 5.0 out of 5 stars
Based on 212 reviews
Total 5 star reviews: 203 Total 4 star reviews: 9 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend these products
Customer-uploaded media carousel. Press left and right arrows to navigate. Press space or enter to open more details.
Slide 1 selected
212 reviews
  • GG
    George G.
    Verified Buyer
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    Reviewing
    3+3 Ratio Electric Locking Machine Heads (PRL-8311, 8322, 8331, 8341, 8351)
    I recommend this product
    Rated 5 out of 5 stars
    5 days ago
    Non Better

    Great product! these are my third set that I purchased. Never disappointed with you guys!

  • DF
    Daniel F.
    Verified Buyer
    6-In-Line Ratio Lefty Electric Locking Machine Heads (PRL-8721-L, PRL-8731-L, Select Finish and Button Style)
    Reviewing
    6-In-Line Ratio Lefty Electric Locking Machine Heads (PRL-8721-L, PRL-8731-L, Select Finish and Button Style)
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Awesome!

    Maybe the best I've ever tried!

  • AP Profile picture for Alex P.
    Alex P.
    Verified Buyer
    7 STRINGS: 7-in-line Electric Locking Machine Heads (PRL-8721-C7, Select Finish)
    Reviewing
    7 STRINGS: 7-in-line Electric Locking Machine Heads (PRL-8721-C7, Select Finish)
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Perfect!

    These fit my Ibanez RG7321 perfectly. Took less than 10 minutes to install. Didnā€™t even need to use the adapter plates or use any screws. Strings are Daddario 10-60 but you could easily fit heavier gauge if needed.

  • JB
    Jared B.
    Verified Buyer
    6-In-Line Ratio Electric Locking Machine Heads Staggered Posts (PRL-9721, 9731, Select Finish and Button Style)
    Reviewing
    6-In-Line Ratio Electric Locking Machine Heads Staggered Posts (PRL-9721, 9731, Select Finish and Button Style)
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Great Tuning Machines

    Very quick string changes, quick tuning and nice smooth operation!

  • KB
    Kenneth B.
    Verified Buyer
    3+3 RATIO Lefty Electric Locking Machine Head Vintage Button (PRL-8341-L, Select Finish)
    Reviewing
    3+3 RATIO Lefty Electric Locking Machine Head Vintage Button (PRL-8341-L, Select Finish)
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Well made product

    As a lefty, I appreciate a quality product made specifically for a left handed guitar.

Reviews LoadedReviews Added