Arkon Slim-Tab Adapter for 17mm Ball for iPhone, HTC, Motorola, BlackBerry, Palm, Samsung and Smartphone - Bulk Packaging - Black Compatible with 17mm ball on ARKON mounts and Garmin Nuvi Mounts Slim-Tab design with quick connection to the mount in use Compatible with all phones and most skins and cases. Fully adjustable with 360 degree rotation for quick portrait and landscape view Great for navigation and handsfree calling