Contact · About Unilock · Lifetime Guarantee · Events · Careers · Downloads · FAQ · Dealer Locator · MSDS · Accessibility. follow us. Twitter · Facebook . Unilock can supply the ideal stones for building retaining walls that suit your vision for your property. Unilock retaining wall stones can be used to add a variety of vertical features to your home’s outdoor areas. Fortunately, Unilock offers homeowners the solution to all of these issues and more with their high quality, durable retaining wall products and stellar customer . Unilock has a wide variety of wall stones you can use to create beautiful, long-lasting retaining walls on your property.