Because these mechanisms are ceramic, they will grind salt, pepper and spices. A bottom-mounted locking grind adjustment knob eliminates the need for an adjustment knob on top of the mill, and the snap-in fitting does not require the use of metal fasteners. This lack of restrictions opens up a whole new world of design possibilities for woodturners. Complete illustrated mounting instructions are included, both have a 25-year manufacturer's warranty. This mill is manufactured to give the greatest flexibility in mill design. With it, you can create traditional as well as upside-down mills. It has ribs that will penetrate into the wooden housing to hold the mechanism horizontally and "catchers" that hold it vertically. Placement of the turning point is flexible which gives the mechanism its unique design characteristics. Although the simplest design is 4 to 8 inches high, you can virtually build a mill as tall as you desire.