Unique hooked wrench design will hold bolted on water pump pulleys by applying pressure against another bolt. The double-sided spanner style holding wrench will hold pressed on pulleys on many GM, Jeep and Dodge vehicles. The double-ended turning wrench will work on 36mm and 47mm/1-7/8" sizes. 1/2" square drive holes in the tools are for use with a hand ratchet or breaker bar to create a handle and allow extra force to be applied.