The Grover Roto-Grip Locking Rotomatics Machine Heads are a practical evolution of the classic Rotomatic design, incorporating a secure locking mechanism to simplify maintenance and improve performance.

Efficient Locking Mechanism & Precise Gearing 

The Roto-Grip system is straightforward to operate: you simply thread the string through the post hole, wrap it once, and tighten the thumb screw to secure it. 

This eliminates the need for multiple winds around the post, which is a common source of tuning instability as strings stretch and settle. 

Internally, the tuners feature a high 18:1 gear ratio for exceptionally fine tuning control. 

Like other Rotomatic models, the gears are sealed and permanently lubricated to ensure they remain smooth and reliable for the life of the instrument.

Versatile Drop-in Replacement 

These machine heads are designed to be a convenient "drop-in" replacement for many standard tuners, making them an easy upgrade for a wide range of guitars. 

They fit the same footprint as the Grover 102 and 502 series, meaning you can often swap them out without the need for new mounting holes. 

The set is weighted at 9.6oz, providing a sturdy, high-quality feel, and includes all the chrome-plated bushings, washers, and screws required for a complete installation on a 3+3 headstock.

Grover Roto-Grip Locking Rotomatics Machine Heads Set Specifications & Features

• Rear thumb screw locking mechanism for fast string changes and better tuning stability

• 18:1 gear ratio allows for highly precise and incremental tuning adjustments

• Sealed-in, permanently lubricated gears protect against wear and debris

• Designed for standard 25/64 inch (approx. 10mm) diameter headstock holes

• Post length of 23mm to the string hole with a total post height of 28.2mm

• Solid steel construction with a total set weight of 9.6oz

• Locking system accommodates string gauges up to a maximum .074 gauge

• Direct replacement for Grover 102, 103, 106, 109, and 502 series models

• Full set of six tuners in a 3+3 configuration

• Includes all necessary mounting hardware (bushings, washers, and screws)

• Durable chrome, gold or nickel finish designed for long-term use in professional environments