These brass bushings are designed to perfectly fit over 6mm knurled potentiometer shafts to provide a solid 1/4 inch surface that fits perfectly with 1/4 inch knobs that use set screws.
If you ever needed to use knobs with set screws on your knurled split-shaft pots, this is the solution you've been waiting for. Perfect fit, no more damage or breaking the knurled top due to overtightening the set screw.
