10.75" (27.3cm) Track Mount With Clamp Base & 1" Ball (sku 56120)The RAM clamp rail track is for heavy duty vehicles. It allows you to have the freedom of the rail mount but on a semi permanent basis. The clamp will attach to any rail, bar or tube ranging from . 625" (1. 58cm) to 1. 25" (3. 17cm). Clamp Range; . 625" (1. 58cm) to 1. 25" (3. 17cm) diameter 0" 1. 14" (2. 89cm) flat surfaces The track length is 10. 75" (27. 3cm) Overall track length is 12" (30. 48cm) The Ball will enter at the center cutout of the