Domed ABR-1 Thumbwheels Bigsby/Maestro Nickel
This is Domed Brass Thumbwheel Set Nickel plated....
If your Guitar has a Bigsby or Maestro Vibrola and you're not happy with the tuning???
Here is the answer....Dome Thumbwheels helps your guitar to get better in-tune!
Set of 2 Nickel Plated Brass Thumbwheels (Domed)
Those Domed Thubmwheels was often used on Vintage Guitars with Bigsby or Maestro Vibrolas