6 inches 5 inches Cast Iron Rigid Top Plate Extra Heavy Duty Swivel 8 inches Solid Stem Medium Duty Total Lock TPR 3 inches 4 inches 3-1/2 inches Rubber Threaded Stem Hollow Rivet Elastic Rubber PA PP Directional Lock Gray Rubber TPU Twin Wheel Plastic Fork Foam PU PU Heavy Duty Dual Pedal Heat Resistant Side Lock 1-1/2 inches 2 inches Light Duty Transparent Anti Static TPR Conductive TPR Wrap Around Special Stem EN1004 EN840