The square sides of these Tungsten Carbide Gravers from GRS have a nice utility ground finish that is straight and square. The pre-shaped blank gives you a head start when creating your own square graver, while the un-shaped blank can be custom ground to any shape you want. Both are 0.083" (2.1 mm) square — big enough for most every job but without the extra bulk that adds cost and sharpening time. Both blanks must be shaped and sharpened before use. Made in USA.