They fit into the shifters to prevent movement. Those come in the levers when you buy them in the OEM state, pre-filled, so that all being well you can connect them to the hoses without needing to bleed.
Too late, Hippy ate them
@MicroDosed™ started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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They fit into the shifters to prevent movement. Those come in the levers when you buy them in the OEM state, pre-filled, so that all being well you can connect them to the hoses without needing to bleed.