... Precision conforms to GB/T 230.2, GB/T 231.2, GB/T 4340.2, ISO6508-2, ISO6507-2, ISO6506-2, ASTM E18, ASTM ... Φ1.588mm 1 pc.Tungsten carbide ball penetrator: Φ2.5, Φ5mm, 1 pc. each Diamond cone ... surfacePrecision conforms to GB/T 230.2, GB/T 231.2, GB/T 4340.2, ISO6508-2, ISO6507-2, ISO6506-2, ASTM E18, ... Φ1.588mm 1 pc.Tungsten carbide ball penetrator: Φ2.5, Φ5mm, 1 pc. each Diamond cone Rockwell ...