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NEW YORK (TheStreet) -- Here's what Jim Cramer had to say about some of the stocks callers offered up during the Mad Money Lightning Round Monday evening:

RR Donnelley (RRD) - Get Report : "I don't understand why this stock doesn't go up. I think this is a good investment."

Ruckus Wireless (RKUS) : "This is too hard of an industry to understand."

United States Steel (X) - Get Report : "I think it's time to swap into Nucor (NUE) - Get Report ."

Plug Power (PLUG) - Get Report : "They need to start showing some real earnings. I'm not going there. I'm not on board."

Sierra Wireless (SWIR) - Get Report : "I'd go with Skyworks Solutions (SWKS) - Get Report . I'd say sell yours and go get some Skyworks."

Fiat (FCAU) - Get Report : "They are doing quite well."

LyondellBasell Industries (LYB) - Get Report : "I'd rather see you in Dow Chemical (DOW) - Get Report , which has come down a lot."

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-- Written by Scott Rutt in Washington, D.C.

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Scott Rutt

At the time of publication, Cramer's Action Alerts PLUS had a position in DOW.