Mill Aluminium Window Grinder 4-part blackThe black aluminium herb grinder 'Mill' with viewing window has a golden coloured grinding chamber with the design of windmill sails with rotor blades for shredding. The corners in the bottom chamber are round so that finely ground material can be removed with the scraper that looks like a plectrum. The grinder has a magnetically closing lid, a nylon friction ring and an integrated screen.