The Diamond Pro® retaining wall systems create flexible, cost effective solutions for a broad range of large commercial, municiple and residential retaining walls. It's the contractor’s choice for large-scale projects, such as tall walls, DOT projects (approvals vary by state), commercial developments, water applications and other critical wall needs. The Diamond Pro product comes with six different face styles and is available in both a rear lip system and a pin system. Select block face styles come in varying depths of 12", 9" and 21" depth.