... cutter ISO standard brazed tips,tips as per national trade standardA,B,C,D,E,G,K,A315,A320 stone cutterISO standard brazed ... seriesA1 type for making external turning tools,boring tools and grooving toolsA2 type for boring cutter and facing toolA3 type for facing turning ... tool,boring and turning toolB3 type for making convex turning toolB4 type for making concave turning tool and wheel edge turning ...