The Arkon MagSafe Heavy-Duty Magnet is a powerful magnetic smartphone holder that includes everything you need to convert a 17mm ball mount into a magnetic phone holder mount. The Arkon Magnet attachment is compatible with our Composite Socket Arm and Flex Arm . Choose between a Flex Arm Adapter or Ball-to-ball Adapter connection. Both connections come with the Arkon MagSafe Heavy-Duty Magnet. Already own our popular Flex-X Phone Mount and want to convert to magnetic? Select the Flex Arm Adapter option.