size :4-10 to 6-32,Two Flute Metric Size for all standard machine tables ... :1)Size or Dimension:Diameter,Total Length,Flute Length,etc;2)Standard:DIN,ASME/ANSI/ISO,etc;3) ... etc6)Any other information you want to know. HSS Step Drill ,Two Flute Metric,Size for all standard machine tables . ... .size :4-10 to 6-32 . HSS Step Drill With Interchan-Geable Center Bits,3 Flute or 4 Flute . HSS STEP DRILLS SET