That is an aluminum spur gear hub employed for the direct spur gear hub specification of this YZ-2 series. It is appropriate for the unique 3-hole spur gear, and has been made extremely lightweight by drilling the holes.
Supported ChassisB-YZ2DTM2S / B-YZ2DTM2 / B-YZ2CAL2 / B-YZ2T / B-YZ2DTM3 / B-YZ2CAL3 / B-YZ2DTM31-1 / B-YZ2CAL31-1 / SOR-010 / ROR-010 / ROR-010RTR / ROR-010RTR-1 / SOR-020 / SOR-020D
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