Cool 2 Metal Grinder Oil 420 50/4. Don’t feel like crumbling? This metal oil colored grinder is perfect for this. “It’s always 420 somewhere” is engraved on the top of this indestructible grinder. This complete good looking grinder is 50 mm wide and has 4 layers. Included is a scraper to scrape out the remains of your weed. You don’t throw anything away.