Sonic flexible flare nut wrenches offer the leverage and torque, while the cutout provides a way to closed fasteners, such as brake, transmission, and hydraulic lines. The 6-point and 12-point design removes 3 points due to the cutout, but the flare nut wrench won’t strip flare nuts like an open-end wrench. Sonic wrenches are made from tough and durable Chrome Vanadium steel for a of use and resistance to rust and corrosion. Furthermore, these wrenches are backed by the Sonic Tools Warranty.