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The Pololu Ball Caster with 1/2” Metal Ball kit comes with everything you need to mount a 12.7 mm diameter caster on your robotic structure.
This complete Pololu kit includes a metal ball caster, an ABS plastic housing, 2 sets of #2 screws and 2 spacers (1.58 and 3.17 mm thick). The kit is designed for small mobile robots weighing no more than a few kilos.