Scooter Bike Crossbar Mount Base with 17mm Ball fits Garmin Cradles (sku 36710)Moped, Scooter Bike Mirror Crossbar Mount Base with 17mm Ball fits Garmin Cradles. This mount base allows you to use your Garmin cradle directly on the mount. 17mm ball simply pushing into the recess on back of cradle. Use with cradles using 17mm attachment system; Nuvi, eTrex, Approach, Dakota, Colorado, DriveAssist, DriveLuxe, DriveSmart, Edge, eMap etc Fits mirror stems and crossbar rails 8mm 15mm Twin screw fitting allen key included Includes