Because these are imported pots, they normally come with metric specs, but these are the harder to come by USA spec version, so they have the same bushing diameter and thread as CTS pots and more importantly they will fit the holes in your USA guitar body with no modifications. They also have a 24-spline shaft instead of the 18-spline shaft found on metric pots, which means all your knobs will fit. Metric knobs are not interchangeable with USA spec knobs.