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The RAM-B-108BU consists of a 1" diameter rubber ball connected at a right angle to a v-shaped base.
The RAM-B-108BU accommodates rails from 1.0" to a maximum of 2.1" in diameter. To mount the RAM-B-108BU 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 screw driver until the strap has a firm hold on the rail.