Turn 90° elbow fittings that are in tight spots with the sockets in these sets. Also known as weatherhead sockets, they have a cut out that encases and tightly grips the fitting, which prevents rounding the corners and edges of the fitting as you tighten and loosen it. They attach directly to your ratchet, so you don’t need to move and reposition them, unlike open-end offset sockets. Only use with hand-driven tools.