That's their coarse stone, approx 320 grit. It should grind fairly aggressively, use a light touch. You might want to buy something a little more refined down the road, but it'll put a very usable edge that should be capable of shaving some arm hair. Light touch, sharpie, and use something cheap to practice on. Also, keep looking on the web and watching videos of how other folks sharpen. It will take some practice, so bring plenty of patience. Always sharpen standing up at a counter or bench that's at a good height. I have the Smith's coarse stone (had it well over a decade), it'll do a very good job.
HH