Keystone jacks came with 2 black things (plastic) what are they for?

I bought tooless keystone jacks that I've just wired and tightened but they two black plastic things that I don't know what they are used for?
davidgareauAsked:
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cbromley33Connect With a Mentor Commented:
If they look like the brown thing in this picture:

http://www.9thtee.com/images/toolscan.gif

They are simply caps to hold the wires in place.
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davidgareauAuthor Commented:
Yep, thanks. The other seems to be for leverage, to tighten the connection.
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