Panacea 89058 Aluminum Fence Rail Mount Bracket Aluminum fence rail mount brackets The black color enhances any surrounding, and the aluminum construction will last for several seasons These brackets easily mount to a rail up to 1.875-inch in diameter, for a versatile holder Space these braces according to the size of your flower box, allowing for 3-inch of overhang on each side, to accommodate a large range of box sizes Measures 11-inch length by 0.75-inch width by 4.375-inch height