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Pololu Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack), allow you to mount custom wheels and mechanisms to 6mm diameter motor shafts. The set includes two hubs, two M3 set screws for securing the hubs to motor shafts, 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/1999