Gainline Capital Partners has announced its acquisition of M&M International.

M&M, founded in 1993 and based in South Plainfield, New Jersey, manufactures stainless steel tubing primarily for medical devices.

Gainline, founded in 2015 and based in Stamford, Connecticut, is a private equity firm that invests in U.S.-based middle market companies. The firm generally pursues control-oriented investments in companies with less than $250 million in enterprise value.

Terms of the acquisition were not disclosed.