TACO ShadeFin Mini Square Tube Rail Mount [T10-4000-9]ShadeFin Mini Square Tube Rail Mount The ShadeFin Mini Square Rail Mount can be used on square rails from 1" to 1 1 2" outside diameter. The square rail mount's secure design can be mounted either vertically or horizontally, depending on preference. Features and Benefits: Includes mounting hardware Constructed out of aluminum grade 6061 alloys with stainless steel Type 304 screws Includes an injection molded nylon cap 3 year limited warranty