Very fine! Just a tip on sawing tubing. Instead of trying to cut it with a fine tooth hacksaw, visit a hobby shop or Hobby Lobby and pick up an X-acto, Zona or Atlas razor saw. It will be a few dollars well spent. I use a razor saw for all straight cuts in wood, plastic or metal. I keep one to use just on soft stuff, like plastic, and another I use for everything. That way I have a sharp one for plastic. (I also have a small tubing cutter I bought for making slot car chassis. Works just like a regular tubing cutter, but is smaller.) gunslinger gary wilcox