Ram Mount V-Shape Base with 1-Inch Ball for Rails and Yokes (Black) 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 Place the saddle shaped plate on the rail then wrap the metal clamp strap around the rail and plate Included in Kit: (1) QTY 6" long metal strap, (1) QTY 8" long metal strap, (1) QTY 5.5" rubber strip that supports the metal straps to avoiding scratching or marking of the rail Powder Coated Marine Grade Aluminum