Metal 2.1mm DC switching jack, commonly used on effects pedals. The quality of these matches their look: sleek, elegant, and professional.
The metal bushing is independent of the power contacts. Some applications will require insulating the bushing from the chassis, so that the shell of the plug won't short to ground.
Tech's notes: "The switching portion allows you to wire to the battery. Then the circuit to the battery will open whenever something is plugged in, preserving battery life."
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Good luck finding a bushing for "special applications". If you're doing a reverse polarity pedal I would avoid these because of the shorting issue mentioned. I like the compact size , simple hole drill rather than D -shape of others, but if this part had a bushing I'd give it a five star rating...now to rework some boxes ;(