The Mendo Mulcher Double Stack is a 2 part grinder, but also so much more than that. The Double Stack is thicker than your standard 2 part grinder complete with grips on the top and bottom for easy grinding. This larger size with grips is especially useful for those with larger hands. The top has a centered magnet that will keep the grinder shut, so it can double as storage as well.
The Double Stack is 56mm which is about 2.25 inches making it a great portable size.
Other Available Sizes:
50mm - (about 2")