This is an idler gear used in the standard 3rd gear of the 2WD off-road car YZ-2CA.

Supported Chassis
B-YZ2CA / B-YZ2CAL2 / B-YZ2CAL3 / B -YZ2CAL31-1 / B-YZ2DTM / B-YZ2DTM2 / B-YZ2DTM2S / B-YZ2DTM3 / B-YZ2DTM31-1 / B-YZ2DTMW / ROR-010 / ROR-010RTR / ROR-010RTR-1 / SOR-010 / SOR-020 / SOR-020D / SOR-030 /