Rubicon Express Jam Nut Crowfoot Wrenches are a compact alternative to bulky and expensive full-size wrenches. Made from hardened steel they attach to a 1/2” breaker bar to provide the performance of a full-size end wrench. Designed to be used on Rubicon Express upper and lower adjustable control arms. Available in 1 1/2” and 1 7/8” size.