Cool 17 Metal Grinder Mix 40/3 Looking for a nice present from the capital of weed.? Search no further.! This strong metal grinder is 40 mm wide and has 3 layers and is ideal for grinding your weed. At the bottom of the grinder is a scraper to use the last remains. You don’t throw anything away. Not a waste. Each grinder has a nice picture of a cannabis leaf with the text Amsterdam and Holland.