Cal-Van Tools’ 6-pc Diesel Injector Line Socket Set features a flex head function that allows the user to apply leverage and access fasteners at different angles. The 6-point crows foot design helps prevent fastener round-off, and each socket is constructed from chrome-moly steel with a corrosion-resistant finish. The 12mm and 14mm flex head sockets are built with a 3/8" drive, while the 16mm, 17mm, 18mm, and 19mm sockets come with a 1/2" drive. Applications include diesel and gasoline fuel injection systems, hydraulic brake lines, power steering piping, EGR system piping, transmission lines, and other flare nut fittings.