Diamond Discs Strauss diamond discs are designed for the fabrication, contouring, and shaping of dental restorative materials, available in the most popular shapes and in 3 grit sizes. The discs are mounted on 2.35 mm Shank mandrel, individually packed and color coded for easy identification. Shape : 355 Size : 190 Grit : Fine Thickness : 0.17 Side : Double