How do you guys remove the crankshaft pulley (harmonic balancer) on a 97 Sentra? What size bolt is it?

I don't remember what size it is, but to get it off depends on if you car is an automatic or manual.
If it is a manual, you can out it in gear and have someone hold the brakes. If it is an automatic, you need an air\impact gun to get it off. I want to say like 19mm, but it seems like it was a standard socket I used in my impact gun.
I did the timing chains about a year ago. Had to buy a tool to hold the engine up for removing the lower mounts.