The exact rotary switch knob you need to restore your old Fender Electric XII. Replaces and is indistinguishable from Fender Part Number 019521 because it is exactly the same part. Molded phenolic plastic, set screw fixing to standard 1/4" solid shaft. Brass insert on bottom for set screw and switch shaft. "DAKA-WARE CHICAGO" molded onto bottom surface of some of these (most have only a lot number stamp...). This switch knob is also exactly the same as found on Harmony, Kay, Old Kraftsman, Supro etc. crackpot guitars.