You know what this is. The pedal industry standard for the longest time. If you're using batteries this is for you. When a plug is inserted one of the terminals will switch off.
This one is white for those pristine builds. Looks great with a powder coated white enclosure (which we have for a really good price :).
2.1mm Boss Style/Industry standard
Mounts in a 1/2 inch/11mm hole.
(You can buy a plastic nut for this jack, if you are into that.)