This heavy-duty impact socket is designed with more than three times the standard socket mass to direct more energy to removing the bolt. Can be used on BMW, Dodge, Ford, Jeep, KIA, Lexus & Toyota engines that use a 22mm hex pulley damper bolt or other 22mm applications. Use with 1/2" drive. 77110 22mm Can be used on Chevy, Chrysler, Dodge, Ford, GM, Jeep and Mazda engines that use a 21mm hex pulley damper bolt or other 21mm applications. Use with 1/2" drive.