The RAM-B-108-GA38U consists of a v-saddle strap base, double socket arm and custom high strength composite cradle for the Garmin GPSMAP® 695 and 696. The v-saddle strap base accommodates rails from 1" to a maximum of 3" in diameter. To mount the base, place the saddle shaped plate on the rail then wrap the metal clamp strap around the rail and plate. Tighten the screw knob on the metal strap with a screwdriver until the strap has a firm hold on the rail. The RAM-B-108BU is an alternative mounting base for aircraft such as the Bonanza or Beech with a “throw over yoke”.