Power, Air, and Hand Tools and Accessories

Designed to Replace Fuel Line Fittings Without Damage to Fitting, Fuel Rail, and Fuel Line Reducing the Possibility of Fuel Leaks. 17mm socket works on Audi® A1, A3, A4, A6, A8, Volkswagen® Passat®, and BMW® N54, N63, and S63 engines. 21mm socket works on Paccar® MX 11, and MX 13 engines. Use with 3/8\" square drive.