Hand taps sets Taper taps,plug taps, bottom taps Made of high speed steel or alloy steel ... standard or ANSI. Hand taps,taper taps,plug taps,bottom taps.HSS or alloy steel,ground thread or rolled thread ... .Type of Thread:Metric ISO thread.Tap Tolerance:Class 2 for 6H fit.Flute Type:Straight ... ferrous and non-ferrous Alloys.Size: M3-M24. Hand tap set,taper,plug,bottom tap HSS alloy steel