BuyBits Extended 1 inch (25mm) to 17mm Adapter fits RAM Mounts to Garmin Nuvi SatNav Holders/Cradles Unique mount adapter which allows you to attach most Garmin Nuvi cradles/holders to RAM motorcycle mounts. Composite arm measures 3 nches between centres. Offer extra reach over tank luggage. Arm can be used with mount bases using a 1 inch (25mm) ball such as RAM, Ultimate Addons, BuyBits & SW-Motech. 17mm ball fits most Nuvi cradles - simply push into the (female) recess. Designed for secure dedicated cradles / holders - holder NOT included