Unfortunately, at this point I would advise against purchasing one of these. They don't come with the right-side freewheel that allows you to pedal. You have to buy that yourself. However, from my experience with the one I recently purchased, the threads on the pedal side of the axle are non-standard and you'll either have to force a standard freewheel on and risk tearing up the threads or you'll have to hunt around for a freewheel with threads as odd as this axle kit.
You can learn all about the fun I've been having with my HD axle kit on my thread entitled, "Wheel Nightmare".
P.S. (Before other folks raise objections here, let me reiterate that I said "my experience")