| 摘要 |
A herb grinder comprising a metal sheet having a first surface and an opposite second surface, the sheet being configured to include, on at least one of the surfaces, a plurality of grooves extending parallel with one another and spaced apart from one another, wherein the grooves and said at least one of the surfaces define a square wave shape having flat valleys and flat peaks, wherein the flat valleys are roughened by a process of photochemical etching. A plurality of holes of a first type, extending from a peak to the bottom surface of the metal sheet, and a plurality of holes of a second type extending from a valley to the bottom surface of the metal sheet. |
