0-HUB03 Aluminum Universal Hub set of two - 4mm <p><font color="00ff66" size="2" face="Arial, Helvetica, sans-serif">These heavy-duty aluminum hubs make quick work of connecting the Standard Sumo Robot Tires to a 4mm shaft. </font></p>
<p><font color="00ff66" size="2" face="Arial, Helvetica, sans-serif">Each hub includes two 5/8" x 4-40 socket head cap screws for the tires, and a hex socket set screw to mount the hub to the shaft. </font></p>
<p><font color="00ff66" size="2" face="Arial, Helvetica, sans-serif">Comes in a set of two for one low price. </font></p>