A chongz 60mm 4 part grinder with diamond teeth and magnets.  A grinder’s sharp teeth quickly and completely shred your flower and its an easy way to get the job done. The grinder also contains the herb, keeping it in one place while you work. Other alternatives that don’t catch the herb as it is ground can be messy and wasteful.  Most better-quality metal grinders have a stack of separate chambers that process your herb. The first chamber has rows of sharp teeth on the top and bottom that shred the herb as you twist the grinder. In the base of this top section, between the teeth, is a series of holes. As the grinder is twisted, small pieces of herb fall through the holes and collect in the second chamber. This prevents the herb from getting ground too finely by the sharp teeth.  The base of the second chamber is often a screen that allows the smaller particles to fall through and collect in the very bottom chamber.