The ESCO Pro Series Pitman Arm Puller, Medium Duty (Model 40321) is designed to remove difficult pitman arms on most medium duty pitman arms on medium duty trucks, transportation buses, and other vehicles. Works on most class 3-5 trucks and equipment such as Chevy 3500/5500, Dodge Ram 3500/5500, Ford F-350 / 550, Isuzu, NPR and more. Manufactured out of a heavy-duty quality steel casting to withstand high capacity pulling and rigorous usage out in the field in all conditions. Bottom hole opening size 2.25 in. and length of drive screw 5 in.