Metal Grinder 42 mm with Leaf. 42 MM Metal Grinder with Leaf Design . 4 Parts with Screen . These assorted Color Metal Herb Grinders have a built-in pollen catcher screen that offer a perfect way to prepare your herb. Diamond teeth effortlessly reduce raw material to fine grain. If you’re on the go, you can trust that the magnetic closure of this metal grinder will keep its contents secure. The exterior of this rugged metal herb grinder is painted with bold leaf designs. Assorted Colors Assorted Colors