Smart Retain™ Wall Posts - Universal Columns offer easy installation for landscaping and civil work, when building a retaining wall needing a connection to other retaining walls. Smart Retain™ Wall Posts are heavy duty and come pre-drilled to accommodate fence brackets. All posts are Hot Dip Galvanised (AS/NZS4680) finish for protection against corrosion. Designed to suit a variety of sleeper products, the Smart Retain™ Wall Posts are available off the shelf in common lengths to suit your project. It is recommended you check with local authorities prior to commencement if these posts are suitable for your application. Features are: They are made to suit 75mm sleepers The internal diameter is 83mm Hot Dip Galvanised to AS/NZ 4680:2006 R3 Durability Rating in accordance with AS/NZS 2699:2002 Light weight when compared to traditional Concrete/Brick Lintels Available in a range of sizes.