DMT Dia-Sharp Diamond Sharpening Card

Forget gold cards or platinum cards, get yourself a diamond card. A credit card sized (80 x 50mm) steel plate coated on one side with a continuous diamond surface, keep one in your wallet for sharpening knives and tools. Available in a choice of three grades: Coarse 325 grit, Fine 600 grit and Extra Fine 1,200 grit.