2 New #4 HSS Square Gravers This is a new set of two #4 high speed steel square gravers Square gravers are used for bold letter engraving Gravers made of high speed steel are harder to sharpen but hold and edge 4 to 5 times longer This can be used on all types of metals, wood, bone, ivory, onyx, etc Used by engravers, jewelers, die sinkers, stone setters and watchmakers It measures approximately 4" (101 mm) long and 1/8" (3 mm) wide