This handy wrench set makes it easier and faster to remove thermostatic fan assemblies on many domestic vehicle engines. The Powerbuilt 2 Piece GM Fan Clutch Wrench set's slim design more easily fits into tight spaces than conventional combination wrenches. At the same time, the built-in 1/2" square drive opening makes it easy to add leverage by using breaker bars or ratchets. These beefy wrenches are heat-treated carbon steel to resist bending and warping under high torque loads. Applications include Ford trucks with 2.8L, 2.9L, 3.0L, 4.0L, 4.9L, and 5.0L engines, Dodge trucks with 3.9L, 5.2L, 5.9L, 8.0L V10 engines, GM trucks with 4.3L, 5.0L and 5.7L engines and Jeep vehicles with 5.2L Engines. The Powerbuilt GM Fan Clutch Wrench set meets or exceeds ANSI standards and has a lifetime warranty.