Estone Grindstone Whetstone Stone Set Grit 180# 400# 800# 1500# For Sharpener System The whetstones are Light, portable, and Anti-friction Easy replace for the whetstone of the sharpener system (in our shop). And easy sharpening all kinds of knives For sharpening kitchen knife, scissors, chopper, hand hay cutter, shave knife, axe etc Sharpening stone can use oil or water