The EZE-LAP Bench Stone Diamond Sharpeners have large surface areas for sharpening a wide range of knives and tools. These diamond bench stones are a perfect size for the garage or workshop. The EZE-LAP Bench Stone Diamond Knife Sharpeners are available as single sided models with Fine 600 grit or Medium 400 grit in two sizes, with non-skid feet. They are also available, in two sizes, as Duo-Grit double sided combination knife sharpeners. The Duo-Grit bench stone sharpeners come in a Super Fine 1200 grit-Medium 400 grit combination, and a Fine 600 grit-Coarse 250 grit combination. A non-skid mat is included.