starter relay kits--what are they?

Lately I've run across what are termed "starter booster relay kits", or words to that effect. These seem to be a relay, inserted in series with the starter solenoid.
Are they to boost a weak solenoid? Don't see how they could boost a dragging starter. If they are to boost a weak solenoid, how does this happen?
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i think its just for the starter relay.
http://www.minibite.com/america/malone.htm
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