Harmonic balancer pullers fit all GM LS Series engines from 1997-2013. They are designed for removing damper pulleys in tight engine compartments without removing the radiator. The kits include a 3-jaw puller, four lengths of forcing rods, and a forcing screw with a 3/8 in. square drive for ratchet use, and a 3/4 in. hex for wrench or socket use.