Made of high-strength annealed ductile iron, this Steel Machine Roller has swivel tops that rotate three hundred sixty degrees (360°) on chrome steel ball bearings to allow for easier turning. The rollers form a “tank track” to revolve around a center load bearing plate in the frame to provide maximum maneuverability. The weight of the load is transferred directly from the load bearing plate to the rollers, eliminating axle friction and requiring less power to start and move. This unit is virtually maintenance free.