So we’re drilling through a couple layers of stainless here, and we’re trying to keep everything straight, and so we’re using a cobalt bit. All the other bits seem to just not want to do it, So, you go a little bit slow to begin with, until you make a mark in it, and then put some speed on it, Perfect, see how fast that was? Imagine being on a steep roof, doing this. But we’ve done it. We’ve tried it with regular bits, and that doesn’t work. Or with the self drilling bits, even those don’t want to work, so now we’re using a cobalt bit, and then we put in a long stainless screw. When you put stainless together with stainless, it’s really a requirement to use stainless screws, because the other screws will back out at a different, they’ll heat differently, and they tend to walk themselves out. Closed Captioning by Kris Brandhagen. [email protected] It’s a good tip from an old friend here.