Genuine Gretsch USA 500K Audio Taper Solid Shaft Volume Or Tone Control Pot. Fits old and new USA Gretsch guitars. Industry standard solid brass 1/4" shaft for set screw fixing knobs. Extra long (I measured .378" overall length...) threaded brass bushing fits through a 3/8"(.375") diameter hole and is great for work on hollow body guitars. Exposed portion of the smooth shaft measures .384" long. Same pots used on many USA Gretsch guitars but you're welcome to use 'em in guitars by Harmony, Kay, Silvertone, etc. The same pot is used for both Volume and Tone control. Brand New. Genuine Gretsch 9221001000. UPC 717669274641.