Ronn, we don't recommend using hammer drill for this diamond bit. The diamond segments are welded/brazed on the bit and hammering action may break the segments.
I didn't get an arbor with the one I ordered. Although I was able to find one on-line.
you need an adapter 5/8-11 to 1/2" shank. Toolocity/Marshall
Yes, you can use this with reinforced concrete.
5/8-11 thread fits on regular grinders/polishers. A variable speed grinder is recommended since the maximum speed for this bit is around 4000 RPM. If you use a electric drill, you will need to get an adapter (5/8-11 to 1/2" shank) to use this bit.