Our original, most popular unit, the Standard unit is the backbone of Versa-Lok retaining wall systems. The units solid construction and unique pinning system provide an endless array of design options, hardcore durability and the fastest, easiest installation available. Not only straight retaining walls, but also curves, corners, columns, stairs and freestanding walls are possible with the Standard unit, making it a universal favorite among homeowners, contractors and landscape architects and designers alike.