KNUCKLEBUDDY® is a wrench extender that adds maximum leverage to your existing wrenches.

Initial proof of concept trials offered tenured mechanics to use this product for three weeks prior to purchasing. KNUCKLEBUDDY® proved to be more productive than using a second wrench that could turn or slip. 

KnuckleBuddy Wrench Extender Leverage Tool

U.S. Pat No. 9,873,194