Teeth not quite concentric with center hole but close enough to work properly. My shaft has runout close to 0, so runout is in the saw. Cut a slot in the end of a .500 inch long 303 stainless steel round bar, .550 inch deep. Made 3 pieces, works perfectly.
What was shown in the picture was not what I received. There was no indexing groove so it wouldn't spin on the shaft, it wouldn't cut stainless steel. I assume they will be working on a cork tree. The HHS blade should cut SST with no problem as evidenced by the blades I bought from another supplier. The new blades I bought go through SST like butter.
Anyone who thinks they have a keyway as described will be greatly disappointed. I even sent the blade back claiming it was missing the keyway and asking for a replacement only to have the same blade returned without the keyway. If I wanted one without a keyway I would order a cheaper one.