Allparts EP-4153-000 Carling SPST Pedal Foot Switch
Neck and Bridge Humbucking pickup ring set, flat bottom, slanted, White plastic. Outside dimensions 3-17/32" x 1-25/32", Inside dimensions 2-3/4" x 1-1/2". The height tapers from 3/16" to 1/4" on the low ring and from 3/8" to 7/16" on the tall ring.
