Sometime last year I picked up an aluminum diamond grinder (smallest size), with a pollen catcher. And it has lasted but it's beaten up. The polyurethane o-ring is loose fitting, the teeth have dulled, the inner holes diameter is too small and have to push green through with a pencil or eyeglasses screwdriver, them cause it gets stuck and clogged, the screen is too fine with it's openings so the grinder never sifted any pollen, at all (and we eventually removed the screen entirely), although it does grind things very finely(good for rolling and you want to avoid stems), and it's portability/size. However I realized it's beat up, an time for a new grinder. Since way back when I had heard about space case grinders, and that they where good. Although I didn't want another aluminum grinder, and space case has a titanium grinder set. This is their smallest grinder, I'll leave it to the pictures to explain, but basically, it solves all the problems that the diamond grinder had. And it does have insane pollen collection, I put a dime in above the screen (I've heard any other coin is too big or heavy), and after two grinds there was a lot of pollen.