Maximum insert dimensions: 11 1/4 x 3 7/8 inches. Overall product size measures 11 1/2 x 4 1/8 inches. Features a standard 1/4" opening drop. Designed with long-side access for horizontal or landscape orientation. Constructed from tough 7.5 mil crystal clear vinyl. As the manufacturer, we produce precise sizes, materials, and options tailored to your requirements.