W6FP 6″ x 2″ (fine 600 grit) diamond stone in plastic case (mountable) w/rubber feet.
DMT® also makes stones with their patented and recessed round holes (“interrupted surface”). The recess catches the “swarf” and aids in sharpening. Swarf is the dirty mixture of water and steel. We call these W-series stones, “holy stones”, due to the holes. . . .