Panel Jacks look very nice when installed threw the shell.  A @ 1/2" hole has to be drilled into the
shell where you want to plug in your cable. Can be wire MONO or STEREO . If wired mono the cable
with the metal jacket around the jack will not work, has to be the cheaper molded  cable at the jack.
See picture above.

If it is wired Stereo for two Triggers you can use either the cheaper molded Stereo cable or the
expensive metal jacket cable will work.
Panel Jacks