GRS&reg; Tools 022-611 C-Max Carbide Graver Round Blank 1/8" This C-Max Round Blank is 1/8" diameter Years of development have now produced a tungsten carbide graver with the right blend of hardness and toughness for hand engraving and stone setting applications C-Max achieves a metallurgical balance like no other carbide For years, engravers and jewelers have used other carbide gravers that break easily or dont hold a fine edge Now, this frustration is gone forever, thanks to C-Max carbide