Lisle 36mm Barring Wrench For Duramax - 22130 is a heavy-duty, chrome-plated steel wrench designed to remove and install the barring gear on GM 6.6L Duramax diesel engines. It features a 36mm hex opening and a 3/8 square drive for use with a breaker bar or ratchet. The wrench is designed to fit the barring gear perfectly, providing the necessary leverage to remove and install the gear without damaging it.