Chrome plated steel. Best currently available ferrules for American Series Teles. The bottom portion of this ferrule fits into a 5/16" hole. The upper 'stepped' portion fits to a 3/8" hole. You can mount these flush to the back of the body '50s style or with the upper portion 'above the deck' '70s style. Brand New. Genuine Fender 0994817000. UPC 717669507213.