The EdgeTek Bench Stone is a lightweight sharpener with a 100% diamond coated flat surface. Designed to provide easy bench top sharpening, the finger grips make it easy to hold and use with one hand. It's easy to carry and protected by a clear, plastic lid for safe transport. Yellow: 325 Coarse Grit. Sharpening area: 6" x 2", size: 7 5/8" x 2 5/8", weight: 4.6 oz.Red: 750 Medium Grit. Sharpening area: 6" x 2", size: 7 5/8" x 2 5/8", weight: 4.6 oz.