Strong and sturdy wall mounting brackets included for added strength and safety. Each shelf holds up to 250lbs when mounted. Stable feet height can be adjusted for added stability on uneven surfaces. Space saver to maximize garage, home, or shed space with 5 tiers of storage. Easy assembly which requires no tools required to assemble. True heavy duty as this product is almost twice as heavy as other plastic shelving units. What you get is a 30lb solid structure shelving unit holding 30 percent more weight than other plastic shelving units. Engineered with fully sustainable recycled material.