M.POWER’S Router Bit Sharpener is the world’s first diamond stone specifically designed to sharpen router bits. It features protected Diamond Cross technology that combines an unparalleled abrasion rate, outstanding durability and ergonomics. A stainless steel core makes the double-sided 300/600-grit stone 100% rustproof. Stone comes with a clever removable grip and M.POWER’S Three-Year Guarantee. Protected Diamond Cross technology Double-sided 300/600-grit Ergonomic grip included 100% rustproof Three-Year Guarantee from M.POWER