Compatible OPC drum haven't a metal gear. This gear should be remove from the original OPC drum with help a flat screwdriver and it uses in compatible OPC drum.
Also searched as:
Canon i-Sensys LBP 252DW,LBP252, LBP252DW, LBP252 DW
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iSensys252, iSensys252DW, iSensys252 DW,
i-SensysLBP252, i-SensysLBP252DW, i-SensysLBP252 DW,
iSensysLBP252, iSensysLBP252DW, iSensysLBP252 DW