The Lisle 5-pc Fan Clutch Pulley Holding Wrench Set, No. 43850, removes and installs pressed and bolt-on water pump pulleys. The set contains wrenches that fit GM gas engines 2000 and newer, Jeep and Dodge 2000 and newer; work on 2009 and newer Dodge Hemi; fits 2001 to 2013 GM Duramax diesels; work on 2011 and newer Ford 6.7L diesels; and fit all sizes of bolt-on water pump pulleys with a cam design that holds the pulley by trapping one of the bolt heads. The set can be used with a 1/2" ratchet or other square drive for flexibility in tight spaces, and it comes in a blow molded case for storage.