Performance Tool W80668 Fuel Tank Lock Ring Tool Remove and install serrated fuel tank retaining rings that hold the pump module inside the tank Fully adjustable feet fit both inside and outside grip retaining rings from 3 in. to 7-1/4 in Provides a secure fit that wont slip or fall off a wide range of vehicles with in-tank fuel pumps Use with both 3/8 in. and 1/2 in drive ratchets, adapter included Applications include Mercedes-Benz, BMW, Audi, Volkswagen, Chrysler, and some Asian vehicles.