A few notes about the RC4WD steel wheels.
First, The hardware is not the best.
The Allen screws that hold the wheel halves together are very small and the hex holes are inconsistent.
Some are too shallow, some the hex hole is too big (loose).
They will round out very easily and also ruin many an Allen wrench.
I had to grind off the end of my Allen wrench several times to get to a fresh tip and replaced some too.
Also, the threads will sometimes strip.
The screws are very tiny and it doesn't take much.
RC4WD sells a set of replacement screws and nuts for the wheels (no wonder) and I highly recommend getting a set with the wheel set.
Second, the holes where the small allen bolts go into the the aluminum piece are not flat, they are drilled instead of milled flat, so the bolt head doesn't have a flat surface to sit on, it is tapered from the drill tip and the edge of the bolt head digs into the taper.
It's one of the smaller issues with the manufacturing of the wheels so I only mention it as another point of the overall quality of the wheels.
Third, the 12mm hex hole in the aluminum piece that screws to the wheels is poorly machined and when you bolt the wheels to your SCX10 the hexes may become jammed into the hex hole, making it nearly impossible to remove the hex from the wheel.
If you already have yours stuck, it is easier to just let them live in there forever and buy some extra hexes for your other wheels from Axial, Part # AX30427 .
On my second set of steel wheels I came up with a good workaround to avoid the stuck hexes.
See the pics below, but basically you file off the paint from the six sides of the Axial hexes, make a chamfer all the way around the outer edge, and file a slight taper on the six flat surfaces making the outer edge the low side. That will keep the hexes from jamming in the wheels.
Forth, the stamped wheel halves are not always stamped clean, meaning some of the bends around the edges of the wheels are "off" or crooked.
But the good news is the wheels look so good after you finally get them together that it still makes it worth all the work. After all, at least someone does make them, it could be worse, no steel wheels at all!