EMERY GRINDING WHEELS CHARACTERISTICS Emery wheels for your burin sharpener. ● For cobalt burins (white, pink).● For carbide burins (Widia) (blue). ■ Sharpeners Mods. "B" ...... 100 x 50 x 20 mm.■ Sharpeners Mods. "C" ...... 125 x 60 x 20 mm.