Adjustable Coffee Grinder Jar Set, 500ml, glass. The perfect cup of coffee not only starts with the beans, but also the grind and the storage. This coffee grinder, with adjustable ceramic grinding mechanism, helps make a great cup of coffee and comes complete with a 500ml glass jar, stainless steel airtight lid and stainless steel grinding bowl. The lid will keep the coffee dry and airtight and the glass jar is perfect for sealing in the rich coffee taste and aromas. How-to-use instructions and recipe included.