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SKU:Guitar tuner-GK-510D8SP-Black-3r3l
PRODUCT DESCRIPTION
Upgrade your guitar with secure string locking and precise 21:1 tuning control. These Guyker locking tuning machines feature a fixed 3R+3L layout and are designed for replacement, upgrade, and custom guitar projects, including compatible ST-, TL-, SG-, and LP-style electric guitars as well as suitable folk and acoustic guitars.
Key Features
- Locking tuner design: Securely clamps the string at the post to simplify restringing and reduce excessive string wraps.
- 21:1 gear ratio: Provides fine and controlled tuning adjustment for accurate pitch setting.
- Fixed 3R+3L layout: Includes three right-side and three left-side tuning machines for compatible 3+3 headstock configurations.
- Modern mounting design: Designed for approximately 10 mm tuner peg holes with threaded bushings and rear mounting screws.
- Multiple finish options: Available in Gold, Black, Chrome, and Chameleon Rainbow.
- Fitment reminder: Please compare the peg hole diameter, post dimensions, mounting screw position, and overall tuner dimensions with your existing hardware before ordering.
Technical Specifications
| SKU / Model | GK-510D8SP |
| Product Type | Locking Guitar Tuners |
| Suitable For | Compatible ST-, TL-, SG-, LP-style electric, folk, and acoustic guitars |
| Layout | 3R+3L |
| Gear Ratio | 21:1 |
| Peg Hole Requirement | Approx. 10 mm |
| Installation Post Diameter | Approx. 9.8 mm |
| String Post Diameter | 6 mm |
| Maximum String Diameter | Approx. 1.8 mm |
| Tuner Body Size | Approx. 27.5 × 23.5 mm |
| Button Size | Approx. 23 × 17.4 mm |
| Bushing Type | Threaded Hex-Head Bushing |
| Color / Finish Options | Gold, Black, Chrome, Chameleon Rainbow |
| Package Includes | 6 Tuners, 6 Threaded Bushings, 6 Mounting Screws, 6 Ferrules |
Compatibility Notes
Important: Designed for compatible ST-, TL-, SG-, and LP-style electric guitars and suitable folk or acoustic guitars. Compatibility can vary by guitar model, production year, factory, headstock layout, and existing hardware. Please confirm your guitar's peg hole diameter, post dimensions, and mounting screw position before installation.
Package Includes
- 1 complete 3R+3L tuner set: 6 locking guitar tuners
- 6 threaded bushings
- 6 mounting screws
- 6 ferrules
Installation Note
Before installation: Compare the product dimensions, peg hole requirement, string post position, and rear mounting screw location with your original tuning machines. Minor modification may be required depending on the guitar model and existing hardware.
Size Reference
Important: Please refer to the size chart below and compare all dimensions with your original tuning machines before ordering.

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FAQS
Do you class a reverse headstock guitar as a left hand guitar?
How do I determine the right size/fit for a specific accessory?
Can you provide more details about the materials used in your products?
At Guyker, we prioritize the use of high-quality materials to ensure the durability and performance of our products. While the specific materials used may vary depending on the accessory, we commonly utilize materials such as:
■ Metals: We often use materials like stainless steel, aluminum, and brass for hardware, bridges, and other metal components.
■ Plastics: Certain accessories may incorporate durable and impact-resistant plastics such as ABS or polycarbonate for knobs, pickguards, and other components.
■ Woods: Some accessories, like guitar knobs or picks, may be made from various types of wood, including rosewood, ebony, or maple.
For more detailed information about the materials used in a specific product, we recommend reviewing the product descriptions or reaching out to our customer support team at [support@guyker.com] for further clarification.
Do you offer international shipping?
Yes, we offer international shipping to customers worldwide. When placing your order, please ensure that you provide accurate international shipping information, including your complete address and contact details.
Please note that international shipping may be subject to customs duties, taxes, and additional fees imposed by the destination country. These charges are the responsibility of the recipient and may vary depending on the country's customs policies.
What is your process for returning or exchanging a product?
To initiate a return or exchange, please follow these steps:
■ Contact our customer support team at [support@guyker.com] or visit our website's Returns/Exchanges page.
■ Provide your order details and the reason for the return or exchange.
■ Our customer support team will guide you through the process and provide you with a return/exchange authorization if applicable.
■ Follow the instructions provided, including packaging the product securely and attaching the necessary labels or documentation.
■ Ship the product back to us using a traceable and insured shipping method.
■ Once we receive the returned product and verify its condition, we will process the return or exchange accordingly.
Can I return or exchange a product if it's been used?
In most cases, products that have been used or show signs of wear may not be eligible for return or exchange unless there is a defect or error on our part. We recommend reviewing our specific return/exchange policy or contacting our customer support team at [support@guyker.com] to determine the eligibility of your particular product.
Do I need to cover the return shipping costs?
The responsibility for return shipping costs may vary depending on the reason for the return or exchange. In some cases, such as if the product is defective or if we made an error, we will provide a prepaid shipping label or reimburse your return shipping costs. However, if the return or exchange is due to a change of mind or a non-defective product, you may be responsible for the return shipping costs. We recommend reviewing our return/exchange policy or contacting our customer support team at [support@guyker.com] for specific details regarding return shipping costs.

GK-510D8SP Guitar Locking Tuners (3L + 3R) - 1:21 Lock String Tuning Key Pegs
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