Base Dimension: 18 inches
Bolt Circle Diameter: 15 inches
Bolt Pattern: 4 Bolt
Max Height: 29 feet
Shaft Max Outer Diameter: 7 1/2 inches
Spec for City of Boston Bi-Metal 18" Base- 12 Flat Flut Shaft
Ordering sheet for City of Boston Bi-Metal 18" Base- 12 Flat Flut Shaft