The HC Companies 24 Inch Heavy Duty Plastic Deck Rail Planter Box with Drainage Holes - White (5 Pack) - Perfect for Balcony, Patio, and Garden Flower Planting

I bought these at 5 for $97, what a great deal. When they came, the ridges on the inside plus the rigidity of the plastic made it so they were not fitting on my railing. I used a heat gun to scrape the ridges on one side off, and they fit very snug, I'm not worried it will fall off. So excited to grow flowers and vegetables on my balcony this year, I will buy more if the price ever goes down again.