-will not break, chip, crack, hollow or groove. -Very easy to use, no oil required. 1"X3" Diamond Whetstonemainly used for sharpening metal & woodworking tools, gardening tools and all household implements and tools, such as knives, scissors, slice, etc...They are electroplated with selective synthetic diamonds on steel base.-will not break, chip, crack, hollow or groove. -Very easy to use, no ...