09-21-2016, 11:27 AM
If those are 3/8" square pieces of tool steel, then relative size of the brazed (cemented) carbide turning tools would be 5/8" or 3/4". They will likely be marked as "BR 10" or "BR 12" (number representing 1/16ths of an inch), with a grade making following that. Depending upon what company made them the grade marking might be in ANSI carbide class grading of C-2, C-5, C-7, etc., or could be a manufacturer grade such as 883, K21, K68, VC2, etc. I can usually tell maker by the grade if it's not an ANSI nomenclature.