Mayne Yorkshire 4822W Window Box Planter Ready-to-assemble kit requires minor assembly, parts glue together easily to create a beautiful finished product (about 15 min to assemble; Kit includes front panel, back panel, bottom panel, left end cap, right end cap, vinyl glue, 4 wall mount brackets with black powder coated finish and screws.) Panels can be cut to the exact length needed to create a custom fit for your windows. This window box features a double wall design creating a water reservoir. Outside Dimensions: 60"L x 12"W x 10"H. Inside Dimensions: 54"L x 8"W x 8.25"D, holds approx. 15 gallons of soil, water capacity is approximately 1.25 gallons (4.7 litres) The weather-proof and ultra-tough construction allows you to enjoy your window box all year long with very little winter preparation. The UV inhibitors within the vinyl allows for a long lasting fade-free performance. 15 Year Warranty  Residential Application, 5 Year Warranty  Commercial Application.