10.75" (27.3cm) Track Mount With Large Clamp Base & 3 x 1" Ball (sku 56125)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 1" (2. 54cm) 2. 25" (5. 71cm) Clamp Range; 1" (2. 54cm) 2. 25" (5. 71cm) diameter0" 2. 2" (5. 58cm) 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 track then slide