String Thru Body 3/8 String Mounting Ferrules for 5 String Bass, Chrome Set of 5 Chrome String Thru Body 3/8" String Mounting Ferrules for 5 String Bass. Brand new, never used. Color: Chrome (Item is made of metal). Height: 13.2mm. Top outside diameter: 12mm. Insertion part into body diameter: 3/8 Inch (10mm). Inside hole diameter: 8.2mm. Please be sure to check the sizes carefully before you order the item. Package Includes: Chrome String Mounting Ferrules x 5.