I call this my transmission line speed wrench. The 12 points (well, 9 now) and narrow shoulder make it much easier to turn the fittings in the cramped underside of the car. I swear a lot less after making this tool.
Craftsman and almost any other good tool makers offer those type wrenches in six sided tubing wrenches
They are thicker on the edges and will work good for a long time without spreading out
Yes Cab, a 6 point line wrench is stronger.
Humpty's idea is when you have a tight work area and you can't get a turn big enough to get to the next flat with a 6 point, use the 12 point till you're close and finish tightening with the stronger 6 point.
