These don't fit solid shaft...just incase anyone wants to give these a try so don't force fit....they only fit split shaft...this is not a bad review these are nice tone knobs... and it seems incredibly hard to find fender strat style 1/4 solid shaft tone knobs...so I took a chance on these I knew what I was buying..but in the listing it didn't say rather they would or would not fit solid shaft and of course splined aren't made to fit them but ...because I've ordered knobs off Amazon that were supposed to be splined....and ended up being smooth..or made for solid shaft...I tried anyway...but these are very nice ...but won't work for solid shaft unless modified to fit..