This is the Fortin ARE-1R0 Transponder LF Antenna Ring.

A low-frequency transponder antenna ring for immobilizer bypass installations.

What does an antenna ring do?

Some immobilizer bypass methods work by reading the chip in a spare key held inside a transponder box. For the vehicle to see that signal, an antenna has to sit around the ignition barrel, where the factory antenna normally reads your key. This is that antenna.

Other antenna options

If you need a fixed-size self-adhesive ring instead, we stock the AR35 at 35mm, the AR38 at 38mm and the AR41 at 41mm, plus the ALU universal loop for barrels that none of those fit.

Not sure which your install needs? Call us on 647-439-4485.