That 'ribbed section' (oooerr) is most likely just a stack of silver spacers, and not part of the stem itself. they fill up the extra space between your headset and stem if you are too lazy to chop your fork steerer to the correct length.
@hamster started
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That 'ribbed section' (oooerr) is most likely just a stack of silver spacers, and not part of the stem itself. they fill up the extra space between your headset and stem if you are too lazy to chop your fork steerer to the correct length.