The RAM-B-138-GA66LU RAM 1" Ball Locking Mount, Pin-Lock™ Security Knob/Key Knob & Locking Case for Garmin from the RAM GPS Mounts range is made of a Pin-Lock™ security knob, a diamond adapter base, a double socket arm, a circular base of 2.5” diameter made with the AMPS universal hole design, and an extra-strong composite locking case made for 660/670 Garmin fleet. With this case from the RAM GPS Mounts collection, you will protect your 660/670 Garmin fleet while allowing maximum access to the memory card area, power plug, and the screen.