Fender Bass String Ferrules - Nickel Genuine Fender string ferrules. Made for Fender Package of four plated steel string ferrules used on most Fender basses with strings-thru-body design Diameter: .519" internal, .62" external. Approximately .55" tall Fits American Deluxe, American Standard, and American Series (USA) strings-thru-body basses manufactured from 1998-Present