![Grover 502CK Roto-Grip Locking Rotomatic Tuners - 3+3, Keystone, Chrome](http://jjmusicsales.com/cdn/shop/products/DEA3F059-D1F9-4759-B112-C35135E96344_{width}x.jpg?v=1652998198)
Roto-Grip Locking Rotomatics utilize the Rotomatic design with a thumb screw mechanism, which locks the string into place
- Insert the string through the post hole, wrap around once, then lock by tightening with the thumbscrew
- Perfect replacement for the most standard machine heads