This thermoplastic picnic table has a 46" octagonal top with a 4" in-ground mounting post. The Perforated style picnic table features thermoplastic covered 3/4" large hole steel on the top and seats. In-ground mounting requires the post to be put approximately 20" into a concrete poured base. This procedure adds stability and vandal resistance. Thermoplastic picnic tables are ideal for schools as they are vandal resistant and low maintenance.