[6 Versatile Sizes for Perfect Fit] These solar post cap lights are designed to fit multiple post sizes effortlessly, including: 4x4 wooden posts (actual size: 3.5x3.5 inches). 4x4 vinyl posts (remove 3.5x3.5-inch base for installation). 5x5 wooden posts (actual size: 4.5x4.5 inches). 5x5 vinyl posts (remove 4.5x4.5-inch base). 6x6 wooden posts (actual size: 5.5x5.5 inches). 6x6 vinyl posts (remove 5.5x5.5-inch base). Pro Tip: Measure your post size before installation for a seamless fit on fences, decks, gates, or mailboxesno electrician required! [Choose Your Perfect Glow] Customize your outdoor ambiance with 2 lighting modeswarm white for a cozy, inviting feel or cool white for a modern, crisp look. Each post cap light features 8 ultra-bright LEDs, built-in reflective cup amplifies illumination, distribute light evenly across your outdoor space. Say goodbye to dark spots and hello to a radiant, well-lit environment that enhances safety and aesthetics.