These WD® hot rod CTS® pots are specially designed and are NOT the same as sold by our competitors. We had CTS® make our pots with a custom designed audio taper as well as tighten the tolerance to ± 9%. On our CTS® 500K pots, we raised the overall resistance to 550k guaranteeing both consistent performance and specs. For example, these tighter specs assure that you will never have a 500k pot with a resistance under 500k, nor higher than 599k. On our CTS® 250K pots, we raised the overall resistance to 275k. For example, these tighter specs assure that we will never have a 250k pot with a resistance under 250k, nor higher than 299k. Compare this with other 500k pots that can vary anywhere from 350k all the way up to 650k! If you compare the standard factory issue pots to one of our WD® hot rod CTS® pots you’ll HEAR and FEEL the difference, and your pickups will thank you. Why buy an expensive replacement pickup and then strangle it with a inexpensive low spec pot? Partner our special CTS® pots with an Orange Drop, Mallory, or WD® oil filled cap and get ready to sound better than you thought possible! 550K knurled shaft potentiometer, ± 9% tolerance, bushing 3/8-32 threads, 3/8 in. bushing height, shaft .238 in. (6.3mm) diameter 24 splines, 3/8 in. shaft length, requires 3/8 in. mounting hole.