DMT Wallet Diamond Sharpener 2 inch x 3 1/4 inch x .05 inch, Fine. Take your sharpening anywhere with the ready-to-go Dia-Sharp(R) credit card sized diamond sharpener. Fits easily in pocket or wallet. Comes in convenient vinyl color-coded (Red) carry case. Fine diamond (25 micron / 600 mesh) for a razor sharp edge.