threading tools ISO standard brazed tips,tips as per national trade standardA,B,C,D,E,G,K,A315,A320 threading ... )1000-7000type seriesA1 type for making external turning tools,boring tools and grooving toolsA2 type for boring cutter and ... tool and wheel edge turning toolC1 type for making threading toolC2 type for making fine turning and trapezoid ... for making V-belt wheel grooving tool threading tools