2.5" Smart Crusher Large Cnc Aluminum 3 Piece Pollen Herb Spice Grinder SMART CRUSHER 3 pc Heavy Weight ALUMINUM Herb Grinder Specially designed by highly sophisticated CNC machines Contains a special teflon O ring which makes grinding even easier with absolutely no metal shavings Two super strong neodymyum magnets are used to keep a nice and tight closure This awesome grinder has a CNC DIAMOND CUT RAZOR SHARP teeth to grind with great efficiency and ease.