Description: Lid: Painted Ductile Iron Lid & Rim, Bolt-Down, Water-Tight, Built-In HandleBolts: Stainless SteelSkirt: Galvanized SteelSpecifications:Manufacturer: Emco WheatonMax Diameter: 18.4"Clear Hole ID: 13.8"Overall Height: 18"Wheel Loading: Meets AASHTO H20EMCO Part Number: A0721-118