Do I just need STI Adapters?

philhul
philhul Posts: 140
edited February 2015 in Workshop
I've just bought a ribble steel frame for commuter duties. The bikes I've built in the past either had internal cable routing or had barrel adjusters already fitted. The ribble frame just has black plastic bits that I'm not sure what to do with. They seem pretty firm but if I force them should they just screw out then I buy some STI adapters to put in? Sorry I'm being thick but I can't figure it out!

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