The trend dwscp8fc is a double sided site and workshop bench stone ideal for up to 3 inch plane irons and chisels the unique clearance channels produce faster cleaner cut with precision flatness and unique diamond shaped surface prevents snagging when sharpening small or pointed tooling grades are marked on stone fine 1000 grit 15 micron and coarse 300 grit 50 micron and is guaranteed for five years recommended use with trend lapping fluid to prevent clogging or rusting and assist in keeping too