The RTS Home Accents Rock Lock Raised Garden Bed is an interlocking border system that looks and feels like natural stone. Achieve beautiful looking walls in just minutes with endless layout possibilities. The easy-to-assemble modules will give you a look and feel of rock walls. The border system is suitable all year round and will not crack, chip or fade in any weather. Rock Lock will also extend your growing season as the hollow walls insulate the soil and plants. I for vegetable gardens, flower gardens, water gardens, retaining walls, sandboxes and playgrounds. Enhance your Rock Lock garden with 28" long galvanized steel spikes to stack Rock Lock straight or curved sections and create a 20" tall garden. Durable Construction: Made from galvanized steel for long-lasting durability. Enhance Existing Rock Lock Garden: 28" spike allows you to safely stack two sets of Rock Lock to create a 20" high wall. Easy Installation: Secure and simple setup in soil or garden bed with RTS Home Accents' Rock Lock Raised Garden Bed system. I Usage: for vegetable and flower gardens, water gardens, retaining walls, sandboxes and playgrounds. Includes 2x 28" long galvanized steel Rock Lock spikes.