Steel Caster Wheel with Swiveling Top Plate  - 8-Inch -  1050 lb. Load Capacity  -  Great for Stationary Loads that are Not Frequently Moved Our Steel Wheel Casters work best with heavy, stationary loads that are not frequently moved. Safe on Hard Surfaces such as Concrete Steel wheel casters have some of the highest load ratings available, and have a very long life Top Mounting Plate: 4.50"x3.94" Bolt Pattern: 3.22"x2.86" Bolt Hole: 0.423" Overall Height: 9.42" Includes: (1) Steel Caster, Wheel with Attachment Plate