Keystone’s Half Century Wall™ offers the distinctive appearance and character of a random-pattern, natural stone wall with the structural integrity, performance, and environmental friendliness of concrete. The three different-size Keystone Half Century Wall units give the look of classic, hand-crafted stone, yet make it fast and almost effortless to create visually stunning and heavyduty wall structures. Keystone Half Century Wall can be combined with Keystone Century Wall™ or used on its own for almost any application. Offering the design freedom to create curves, 90° corners, battered and near-vertical walls, terraces and more, Keystone Half Century creates limitless design possibilities. Keystone Half Century is also easy to install and utilizes a unique, patented fiberglass pin connection method for added structural integrity and performance. The open-core design of the Keystone Half Century units allows for additional facial stability and interlocking capacity. Offering a quaint, old-world appearance while providing superior strength, Keystone Half Century offers a unique structural retaining wall option.