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Pololu Universal Aluminum Mounting Hub for 3mm Shaft, #4-40 Holes (2-Pack) allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #4-40 screws (not included).
Pololu Web Site: http://www.pololu.com/product/1078