A Synthrotek original, these tall vertical potentiometers (or "tall pots") were designed specifically for use in guitar pedals. They are tall enough to be PCB-mounted alongside a 3PDT switch and still clear through the top of an aluminum case (see picture). They are also handy in board-mounted projects going in 1590DD aluminum cases since the tops of the cases can vary widely in thickness.
Overall length is 31mm from top of shaft to the bottom of the PCB-mount pins. The threads are 10mm tall.
View the Synthrotek tall pot data sheet here.