Piling Canada
Written by Piling Canada
July 2026

White maple leaf against red background

Entegra Attachments, LLC, of Saint Charles, Ill., is pleased to announce its acquisition of TEI Rock Drills, Inc., a Montrose, Colo.-based manufacturer of specialized drilling machinery used in underground utilities, mining, tunneling and construction applications.

The company’s equipment is essential for bridge foundations, soil stabilization and limited-access installations. TEI Rock Drills, at its inception in 1980, was a pioneer in portable hydraulic rock drilling equipment, begun by company president Sue Frank’s father, Bill Patterson, who was previously with Gardner-Denver as its chief engineer.

Roughly 50 per cent of the company’s product sales are excavator attachments, hydraulic rigs and other equipment (such as electric-powered track rigs designed primarily for interior applications), with the other half coming from drill heads, parts and accessories.  A large majority of the company’s revenues come  from highly satisfied customers who have been doing business with TEI for over five years.

This internationally positioned company manufactures its products out of its headquarters facility in Montrose, using primarily North American components. It occupies a premium market position, with patented technology to optimize drilling power with superior useful life, all while increasing productivity and reducing downtime for customers.

Mike Flannery, Entegra Attachments’ CEO, indicated that the acquisition of TEI Rock Drills significantly enhances Entegra’s pile driving and drilling platform and complements its former acquisitions and integration of Fort Wayne, Ind. based Hercules Machinery Corporation and Titan Metal Worx. “HMC®,” said Flannery, “was the pioneer in North America and is now the leader in the supply of the most durable and reliable vibratory pile driving systems available today. TEI’s winning proposition in drilling systems plus HMC’s premier position in pile driving, supported by the highest service, expertise and training, makes for an unbeatable proposition.”

Sue Frank, TEI’s president since 2006, commented that a careful decision was made in selecting the right company to partner with to support its growth investment goals. “Entegra’s people-centric values, portfolio synergies, expertise and superior investment capability were among the main reasons for our decision to join the Entegra family of highly specialized companies.”


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Piling Canada is the premier national voice for the Canadian deep foundation construction industry. Each issue is dedicated to providing readers with current and informative editorial, including project updates, company profiles, technological advancements, safety news, environmental information, HR advice, pertinent legal issues and more.

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