I've run 2-4lbs of dried herbs each every year through these things for countless years now and they keep on going. Just received another large 2pc, another large 2pc that has ground no less than 5lbs dried herbs works very close to as well as the new one I just opened. 2-piece is all you need imo, 3-4pc grinders are expensive gimmicky nonsense. SCS gives me the best doink texture and does it very quickly.Protip: wrap the top and bottom halves with a size #73 rubber band each for grip, and so you can smack the two pieces together without scratching the anodization. Rubber grip makes spinning this thing nearly effortless even with the hardest of dried herbs. Sizes 62, 63, 64, 72, 73, 74, 82, 83, and 84 will all fit parts of the large, with 84 being a bit too tall for the "knurled" half of the grinder but 82/83 can fit. For one size that'll work on either medium or large SCS I would recommend size 73. Regular rubber bands grip better than the black "tactical" type ime.Funny that the pics for this listing cite "32 sharp teeth" when in fact none of them, or at least no model I've encountered, has 32 teeth: the "large/2.7in." has 36 teeth, and I think the medium has 28 or lessons. Doesn't matter, they are all very sharp with super unique geometry and they work great!The hemp version of SCS is better than the vast majority of other grinders too.Thanks