Rugged structural foam plastic construction will not dent or bend. 3" protective edge on all shelf sides prevents accidents. Angle legs with reinforcing gussets provide upright strength and torque-free stability. Non-marking 5" plate-mount casters (2 ea. fixed, 2 ea. swivel). Casters mount to upright leg base for extra strength. No handle assembly required. Ships knocked down and assembles easily in minutes. FOB Shipping Point.