Description:100% Brand new and high quality Features: Straight threaded flute， Plug type， Taper cutting edges and 2.5mm diameter flute，Suit for machine use to cuts a thread on the inside surface of a hole， creating a female surface which functions like a nut.A taper tap offer a very gradual cutting action and is most often used when the material to be tapped is difficult to work (e.g.， alloy steel).Material: 6542HSSColor: SilverSize M1: Dia(mm) 1 Screw pitch(mm) 0.25 Straight flute(mm) 2.8Size M2: Dia(mm) 2 Screw pitch(mm) 0.4 Straight flute(mm) 2.8Size M3: Dia(mm) 3 Screw pitch(mm) 0.5 Straight flute(mm)3Size M4: Dia(mm) 4 Screw pitch(mm)0.7 Straight flute(mm)3.1Size M5: Dia(mm) 5 Screw pitch(mm)0.8 Straight flute(mm)3.3Package included:5pcs x HSS Machine Taper TapNotice:1.Please allow 1-3cm error due to manual measurement.2.The colors may have different as the difference display，pls understand.