This lifter is designed to attach to and lift 4 Cylinder Gardner Denver Air Compressors from EMD SD70 MAC Locomotives. It will lift direct drive compressors as well as those with electric motors, and is an attachment for the T57170 C-Frame Manipulator. It is a two piece lifter - the first being a 17" extension arm, while the second is a spreader bar with chainfalls. The spreader bar has a series of attachment points which allows adjustment for a level lift.