For a concrete wall, the width of two brackets should be 16. The cable ties included can be used to tighten the wire grid for added stability. Our versatile 6ft wall shelves provide the perfect storage solution for all your garage essentials and bulky items, keeping your garage floor free of clutter and improving your organization. At WORKPRO, we're committed to providing high-quality products and excellent customer service. We're here to help you get the most out of your space.WORKPRO 2-Pack of 6ft garage wall shelving comes with 4pcs 72" x 12" wire grids, 8pcs shelf brackets, 2pcs installation templates, and a full set of hardware, including 26pcs #8x45mm hexagonal head self-tapping screws, 26pcs anchors, and 10pcs cable ties. With a load capacity of 800 lbs total, they can handle everything from power tools to sports gear, making them a durable and versatile storage solution for any garage.