These universal aluminium mounting hubs allow you to mount custom wheels and mechanisms to 4mm round or 'D' motor shafts. The set includes two hubs, two M3 set screws for securing the hubs to motor shafts, and one 1.5 mm Allen key for use with the set screws. Each hub has four threaded mounting holes for M3 screws, the M3 screws are not included.
Size : 19mm Diameter x 5mm Thick
Weight : 3.2g (Without set screws)
Shaft Diameter : 4mm - Round or 'D' shaped
Mounting hole size : M3 - Not Included
Set screw : M3 - Included