Austin, Texas-based private equity firm Peak Rock Capital has acquired Main Steel Polishing Co. Inc. from Shale-Inland for an undisclosed amount.

Main Steel, headquartered in Elk Grove Village, Illinois, processes and polishes stainless steel, aluminum and nickel alloys for the transportation, fabrication, petrochemical and food services markets.

Peak Rock plans to add companies in the metals processing and trolling sector to Main Steel. The PE firm makes debt and equity investments in middle market companies. In June, the firm bought home improvement group RCR International Inc. Peak Rock closed its inaugural fund in September 2013 with $700 million in capital commitments. 

The seller, Shale-Inland, is a Houston-based company that supplies pipes, valves, fittings and other products to the energy and industrial sectors.

Stout Risius Ross acted as Peak Rock's financial adviser on the deal. 

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