For a comparable, the Stanley Black and Decker Tools division has profit margins of 13%.
From the recent 10-K:
Segment profit increased $223 million from 2010, inclusive of $20 million in merger and acquisition-related charges. Excluding those charges, 2011 segment profit was $702 million, or 13.4% of net sales, which compares to 2010 segment profit excluding merger and acquisition-related charges of $585 million, or a consistent segment profit rate of 13.4%. Aside from the impact of merger and acquisition-related charges declining by $107 million, segment profit increased in 2011 due to the favorable impact of cost synergies, higher sales volume and continued growth in Latin America. CDIY segment profits in 2011 also reflect the unfavorable impact of unrecovered commodity cost inflation, the impact of promotional spending associated with older generation products (which offset other product list price increases), and the continued impact of the previously discussed Pfister business loss.
Also, it shows that Stanley's CDIY, or Tools Division, had sales and profits of $1.258 Billion and $141 million respectively in 2009 (pre-merger; does not include Black and Decker). Profit margins were around 11% for Stanley Tools.
You can make your own assumption for Craftsman's revenues, margins, etc. I'd think Craftsman would be worth between $1 and $4 Billion.
Google Trends shows that people search for "Craftsman Tools" around 2X more than "Stanley Tools". That could imply that Craftsman Tools has twice the selling potential? That's a huge question.
http://www.google.com/trends/?q=craftsman+tools,+stanley+tools&ctab=0&geo=all&data-ipsquote-timestamp=ytd&sort=0