Warren Buffett has described the cash pile held by his company, Berkshire Hathaway, as an "elephant gun." And while guessing what Buffett may use his elephant gun on for his next purchase may be an exercise in futility, it can serve as a screener of sorts when looking for new stock ideas.

Massive brands, wide moats, recession-proof operations, or a Benjamin Graham-worthy valuation -- there are many possible hallmarks of what may qualify a company as a "Buffett stock."

Three Fool.com contributors believe The Home Depot (NYSE: HD), Old Dominion Freight Line (NASDAQ: ODFL), and AutoZone (NYSE: AZO) would make great additions to Buffett's portfolio for the long haul.

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Source Fool.com