The next generation of grinders has arrived from Cali Crusher. Many improvements have been made from the traditional grinder. To name some of the features, the unit allows for much easier kief collection with a rounded collection chamber. The catch screen can easily be cleaned, upgraded or replaced using a hex key. The Medical Grade Aluminum has a 4-Way Quicklock feature, eliminating cross threading incidents and jammed grinders. Combined with a 2x larger catch tray, this is a grinder you need on your station. Made and invented in San Diego, Ca. Check them at Calicrusher.com or ask for them at your favorite smoke shop.