This part fits the following vehicles:
DR10, DR10M, Pro2 DK10SW, Pro2 LT10SW, Pro2 RT10SW, Pro2 SC10, ProSC10, RB10, Reflex DB10, SR10, Trophy Rat
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Stock plastic wheel hex is 8.5mm.
If you want to change to an aluminum hex, the #71014 would be an upgrade.