This four piece herb grinder has been a Kannastor favorite for over a decade! Equipped with a replaceable screen, an engineered drop through design that prevents over-shredding and a limited lifetime warranty, this modular grinder is designed to last! Made from 61/61 Anodized Food Grade Aluminum. Kannastor classic original multi chamber herb and spice grinder, created in 2003. Updates for 2017 include new and improved industrial materials, magnets, a perfectly smooth polished base tray, and deeper sifting chamber for an easier pour.