The SP Tools Shouldered Crow Foot Socket Set, No. 15000, incorporates a shoulder that acts as a blind stop to aid in the installation of hard-to-reach flair nuts. This tool is designed to allow technicians to push on the line while simultaneously turning the fitting by hand to start the threads on hard-to-access fittings. The blind stop helps reduce the flex inherent in standard open-end crow foot socket sets, the company says. These 12-point 3/8" drive sockets are designed to make it easier to work on power steering lines in confined spaces and mechanical fittings with double flare nut connections.