Norton Abrasives single grit sharpening benchstones are suitable for hand dimensioning & sharpening of all types of plane blades, knives, chisels and other tools. The use of oils with these stones minimise clogging & enhance the sharpening actions, resulting in fine grade sharp edges. They feature aluminium oxide or silicon carbide construction for long lasting cutting edge and minimal loading, respectively. Further, these oil-resistant benchstones come with coarse grit for restoring worn cutting edges & allow sharpening and are available in brown & white colours.