Free Drifter Knife from Columbia River Knife and Tool. A $40 value, free with purchase of a DD500X * Quickly align and sharpen drill bits * Sharpens 3/32-Inch to1/2-Inch standard twist bits and creates split points * Sharpens high-speed steel, masonry, carbide, and Tin-coated bits * Three-year warranty is valid only in North America on 110-Volt power sources