The parts are not quite wide enough for the Ducane 4100. However, if you push the grates together in the middle, the gap is on the outside edges, which is no big deal. Unless, for some odd reason, you like to cook your meat with it up against the wall of your grill. I like the heavy grates but have not had them long enough to say yay or nay from a durability standpoint. I like the weight, however and after a couple of uses, the grates seem to work well.
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