Bloom Master Planter Box BracketsUse these planter box brackets to secure your planter box full of flowers or vegetables on a railing or ledge. 1. 5" Square Planter Box Brackets This steel made product is painted black and attaches to the end caps with 4 push pins for each individual hanger. Decorate your porch or balcony railings with this useful tool. Attach the metal bar into the side of the end cap. Align the holes in the hanger with the holes in the end cap. These holes allow