I bought these four A500K 18-spline split shaft audio pots for a Westcreek Racer dual-humbucking guitar that had terrible pots (I also replaced both pickups at the same time). These did the job for both volume and tone pots. They have a nice taper to them and the volume pots clean up nicely as you turn down the volume. They feel solid.I used a multimeter to measure each of the pots before they were installed in the guitar. The pots are listed with a tolerance of 20%, which means you could end up with pots between 400k and 600k. My values were within 10%: 448k, 458k, 490k, 524k. Just what I wanted.In case you’re wondering, these will fit “metric” guitar knobs (which are usually found on the import guitars). I also ordered the 24-spline pots – they fit my knobs for my American made Gibson.Impressed. I’ll buy again. A+