Palm pedal

A palm pedal a mechanical device that consists of levers attached to the strings of a guitar or other stringed instrument for the purpose of pulling the strings up in pitch to a preset half-step or whole-step.

The palm pedal was invented by Boomer Castleman, an American guitarist and singer-songwriter, who designed the prototype in 1968. Bigsby was the manufacturer of this product in the early 1970s. Pro Palm Pedals, a company in Nashville, has been producing palm pedals since 2009.