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Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack) allow you to mount custom wheels and mechanisms to 3mm diameter motor shafts. The set includes two hubs, two M3 set screws for securing the hub to motor shaft, and one 1.5 mm Allen wrench for use with the set screws. Each hub has four threaded mounting holes for M3 screws (not included).
Pololu Web Site: http://www.pololu.com/product/1996