Its broad, flat surface is ideal for sharpening … Shop for Low Price Spyderco Ceramic Bench Stones Fine Ceramic Stone .Price Low and Options of Spyderco Ceramic Bench Stones Fine Ceramic Stone from variety stor Spyderco’s ceramic files are specifically designed for sharpening … Made from ultra-hard alumina ceramic material, Spyderco's fine-grit benchstone is used like a traditional sharpening stone, but does not require oil or water. Made from ultra-hard alumina ceramic material, Spyderco's ultra-fine-grit benchstone is used like a traditional sharpening stone, but does not require oil or water. Needed about 1-2 hours on a diamond stone to get it flat. Across the shorter (2") dimension it was flat. Ceramic File Slip Stone 400F1SP Sold Individually $23.00 MSRP. Description . Stone was not flat along the longer (8") dimension. Its broad, flat surface is ideal for putting … Quantity . Technical Specs . Given how most would use the stone might not be an issue. Ceramic File Slip Stone 15/32. Same non-flat was found on the medium bench stone …