On Wed, 26 Aug 2009 11:46:50 -0700 (PDT), DerbyDad03
wrote:

As per the subject line...

Items 1 -3 of this page,

http://search.hardwarestore.com/?que...ector&tId=2664

Specifically:

http://electrical.hardwarestore.com/...rs-640738.aspx

What are they used for?

These are used in wiring buildings where wire-eating rats are common.
The rats see the connectors, and assume no wires are present.