Garmin Alpha 100, Garmin Astro 320, Garmin Astro 220, Garmin Tri-Tronics Pro Series Trashbreaker Quick Connect Kit -3 PC.-Easily Interchange Your Garmin Handheld Antenna to your Garmin Mag Mount Antenna Works for Garmin Alpha 100, Garmin Astro 320, Garmin Astro 220, and Garmin Tri-Tronics Pro Series Trashbreaker Handhelds 3 Pieces Include - 1 Handheld Attachment and 2 Antenna Attachments 1/2 Turn off and on to change out your antenna Saves wear and tear on Garmin Handheld threaded antenna connector Must have for those Garmin GPS Dog Tracking Hunters/Runners that are in and out of your truck often