Replacement top cap for extendable steering bar for Segway miniPRO and Ninebot miniPRO. The original part is made of weak plastic and will easily break (probably why you're looking at this here). This part is made with a more durable plastic than the original, and very less likely to break.
If the plastic stem does not easily fit in the metal bar, it can be sanded slightly. It will will very snugly.