Whetstone 300# 1000# Sharpening Stone Diamond Knife Sharpener Whetstone Dual Sided Dual side diamond stone: Grit #300 + #1000. Coarse and Fine double side. Material: Diamond electroplated on both side. The diamond sharpener can be used directly or with oil. Please DON'T saturate it with water or it will speed up peeling off the metal plate. Size:7.8"x 2.6"x0.3"(19.7x6.5x0.8cm). Much more efficient and fast than waterstones and less risk of damaging the edges. A nice choice for ice skates Package Content: 1x Diamond Knife Sharpening Stone