0-PL1078 3mm Aluminum Mounting Hub - Set of Two <font color="00ff66" size="2" face="Arial, Helvetica, sans-serif">These universal mounting hubs are designed to work with most 3mm shafts, including round shafts, &quot;D&quot; shafts, and Tamiya's 3mm hexagonal shafts. Each hub has four mounting holes for 4-40 screws (not included), letting you mount custom wheels or mechanisms to your motors. 4-40 hex set screws (one included for each hub) allow secure coupling of shaft to hub. A 0.05&quot; hex wrench (often the smallest size in SAE Allen wrench sets) is included for use with the set screws.</font>