You might argue that the best grinders have at least four pieces in order to incorporate a pollen catcher, but all that does is remove some of the potency of your dry herbs. A two-piece grinder does nothing but grind the herbs to perfection, and since this grinder is made from the finest cured and aged rosewood, it won't taint the herbs with any foreign flavor. The pins that actually do the grinding within the device are made from stainless steel, which is essentially inert when used in this fashion.
The grinder also uses powerful magnetic connectors so you won't have to worry about the pieces separating unless you separate them purposefully. The grips are made with an ergonomic shape that makes grinding easy, and the pins are guaranteed to never break or bend. Very few grinders have the same inherent quality as this rosewood grinder from RYOT.