Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How coarse is the coarsest grind? Meaning can I use it to blacken food?
Document: I wuldn't recommend it. All of a sudden, while I was grinding pepper on my ready food, the whole inside with all the peppercorns in it fell out, the little screw on the bottom broke in half. It was less than a year old. I just oredered a William Bounds Pro View pepper mill. People who reviewed latter, were happier with the adjustability from fine to coarse. The Magnum was always uneven for me.
I've just encountered the same problem with this 9" model as several people have had with the 5":  after 2 years' use, the entire grind mechanism fell out of the mill, while I was using it, causing whole peppercorns to fall all over the food I was preparing (not to mention the kitchen counter, the floor, etc.). The grind mechanism is held in place by two screws that go into plastic posts molded onto the likewise plastic body.
Works well except the adjustment knob keeps loosening during use. This causes the grind to go from fine to coarse. Kind of a pain constantly adjusting it back down. I gave one as a gift and the other one does the same thing. Must be a design flaw.-Jeepin Jesse
Very frustrating but I got use to it even though it still happens after so many years of trying not to touch the fill ring. This could have been so easily avoided by making the fill ring open by turning the opposite direction or a simple plug to cover the hole rather then the turning neck. Just plain stupid!The second issue is the bottom screw which adjusts the grind from coarse to very fine.
This grinder holds a lot of pepper and it mills a wonderful coarse ground mill. Just a few turns and you have ground a tablespoon. It has not failed and after going through close to 2lbs of pepper I can tell absolutely no change in the quality of the grind.As to the comments about the refill opening coming open when you use it. I have not had this problem at all. Personally I just think that it would be hard for that to happen unless you try to make it happen.
This is my second Unicorn Magnum peppermill. I had the first one for a few years--used daily and finally had to be replaced when the top nut attachment snapped. Originally purchased based on recommendation from America's Test Kitchen. Lived up to being a fast, high-volume mill with a range of very fine to very coarse grind levels. Our family loves freshly ground pepper and a lot of it. It sits on our dining table for easy use.
I loosened the adjustment mechanism to change the coarseness. So, this is likely one of the best pepper mills, but you must not use it for a coarse grind....Since originally writing this review, the sellers have replace my mill. I raised my rating from 2 to 3 stars for this. I am still disappointed it broke, but much happier that they did replace it for the cost of shipping both ways. I also believe that you can still break these under normal operation too easily.
After two (2!) William Bound pepper mills purchased at the same time both broke in exactly the same place after only two years of use, we began looking for new mills. Who knew finding a decent mill would be so difficult? The plastic housing is off-putting, but other than that, we are happy with this mill. We prefer a truly coarse grind, and Unicorn Magnum delivers.
I use the Magnum size on my kitchen table, as it is a better size for individuals who just want to add some pepper to their food. I have a couple of the matching salt grinders to go with them, and they also work well.Magnum Peppermill - 6-InchMagnum Salt Mill- 6-InchIt has one real flaw, though. The ring that opens the filling hole turns way, way too easily.
This mill is such a joy to use I find myself making up excuses to pepper all of my food. Just last night a potato,leek and asiago pizza came alive with just a twist of the wrist. Watch the conversation pique when you add pepper to your guests' cocktails. Sailors used to go far and wide to trade in spices and this grinder reminds us why.Why is this mill so great?1. I filled it in 10 seconds. It was easy.
Answer: Very course. I've never had one as course and good adjustments