SE DF8512DSB 3-Piece Diamond Coated Whetstone Set, Grits 180/260/360 3 color-coded whetstones Blue = 180 grit/yellow = 260 grit/red = 360 grit High longevity diamond coated whetstone set Dimensions are 3 x 1 x 1/8 making these whetstones very efficient yet compact tools Hole on top for hanging