The lets you take it with you and mount it anywhere. No more trying to make your fly rod fit into conventional/spinning rod holders. This is not a trolling unit and should only be used to carry your rod during transport.• Measures 10"H x 4.5"W• Extends 4.25" from the surface when mounted• 1.25" inside diameter rod holder• DelStang fly rod holder• Powered by powerful 120-lb. pull-strength rated 4.5" vacuum mount Securely attached with a powerful 120-lb. pull-strength rated 4.5" vacuum mount 1.25" I.D. rod holder