Pololu Universal Aluminium Mounting Hub for 4mm Shafts - M3 Holes (2-Pack)These Pololu universal aluminium mounting hubs allow you to mount custom wheels and mechanisms to 4mm diameter motor shafts The set includes two hubs, two M3 set screws for securing the hubs to motor shafts, and one 1. 5mm Allen wrench for use with the set screws. Each hub has four threaded mounting holes for M3 screws (not included). We have an assortment of universal mounting hubs available, spanning several shaft sizes and featuring mounting holes
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