Material:420 Stainless Steel Weight:625g. The M40 hand bean grinder has set a new high price for such a product, making it a new favorite among high-end coffee lovers. The M40’s central shaft is fixed firmly and will not shake during grinding. At the same time, the bearing is very smooth and labor-saving. The grip is ergonomic and comfortable to hold. The highest precision cutter head design, innovative and improved cutter head geometry structure, to create high temperature wear-resistant, high nitrogen steel core strength is more than 2 times that of ordinary 304 stainless steel, prevent breakage, prevent high temperature, not easy to generate heat during grinding, better keep the coffee beans due to temperature changes damage the original taste.