OTC's Engine Barring Splined Male Socket is designed for use on Mack E7s and Cat 3208s. Special tool engages engine and allows it to be rotated for injector work, valve lash adjustments, and more. Durable steel construction. Similar to Kent-Moore J-38587-A. Value is at the core of the OTC tool and equipment portfolio. Whether it's a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it's a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians' productivity and shop profits.