Graph tech - Ratio tuned machine heads for electric guitar.

One turn equals one tone on every string.

Vintage, waffle-back design.

Open back with hardened steel gears. 

12:1 - 39:1 gear ratios. 

Round, vintage style buttons. 

Singles.

3-a-side.

Nickel. 

Note: Vintage specification (for 11/32" peghead holes) not a direct replacement for a modern machine head.