For rewiring vintage pedals or effect fieldFor electro-harmonix, T Rex, Retro FX, Radial Bigshot, etc effect pedalsFor unbuffered/true bypass effect circuit without coloring the tone of the instrument or other elements in the signal chain9-lug switch can be used for rewire vintage pedals or effect field, for unbuffered bypassing/true bypass of the effect circuit without coloring the tone of the instrument or other elements in the signal chainThe third pole can be connected to control the status light LED or other custom feature There are a total of nine terminals on each switch, three per pole A mounting hole of at least 7/8" diameter and 1/2" diameter is required Threaded part is 7/16 inch high Hex nuts, lock washer, flat washer includedColor: BlackWeight: 20g Insulation Resistance: 100Working Current: 4A Package Includes: 1pc Guitar Effect Switches