Retrofits your Fender five hole mount bridge on your 4 string bass using the two outer holes and the center hole. These bridges feature variable string spacing via an adjustment on the string saddles, and precise intonation adjustment. The style and appearance of the bridge is boutique inspired. These are available in two different material constuctions: Brass and Aluminum.Aluminum is available Satin, Chrome, and Black Finishes. Brass is available in Chrome, Black, and Gold. These bridges are available in the following spacings in .750" (19mm) Spacing.