1000 Grit  Thin Profile Anti Slip backed  diamond sharpening stone/card, easy to take camping, use in the  kitchen, on garden  tools and woodworking tools . 

The use of diamond as an abrasive material is more efficient than a normal whetstone and less risk of damaging the edges.

Single side use, about 1mm thick, taking little room, and can be fixed on any flat surface. Size: 6.3cmX15cm.

The use of Tung oil (spit) or a light machine oil is beneficial