This set from XRAY includes ten cone washers sized 4.2mm inner, 10mm outer and 0.4mm thick. They are intended to help keep components seated correctly and reduce slop in assemblies.
The cone profile provides a tight interface that limits lateral play, so steering inputs and suspension reactions remain repeatable. These washers are useful when dialing in setup or replacing worn shims.
Use them on suspension linkages, hinge pins or wherever a small tapered washer will improve engagement. Their build quality supports regular hobby use and workshop tuning.
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