The point of splines is that they fit in those wheels that have narrow lug holes. For example, on the Enkei RPF1's I have my socket makes contact with the outside of the lug hole when pulling off my 6-sided lugs, it still works, but it's a real tight fit. With my spline-drives, that gizmo key thingy has all sorts of clearance because the spline-drives themselves are so narrow.
Splines would actually be really sweet if only someone (*cough* Snap-On) would make a 1/2" drive, heavy duty, spline socket. Because it's only that key that sucks.
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