ADJUSTABLE GRINDING The center cone is held in place by a metal plate with divots and a locking nut that has tiny spring-mounted ball bearings, which provides a tactile click when turned so you can feel confident about how many clicks gets you to preferred grind. DURABLE And EFFICIENT BURR A hand ground 420 stainless steel burr of professional, nay museum, quality. The grind experience is chill inducing., buttery smooth. Like walking on a fresh layer of dry snow on a brilliant sunny winter morning. EASY To COVER THE TOP The magnet on the central axis makes it easy for to cover the top cover, and prevents it from falling off while grinding the coffee. High quality bearings support the turning shaft to eliminate wobble and make a consistent grind.