5pcs M3 M4 M5 M6 M8 Nitride Screw Tap Metric Spiral Hand Thread Screw Tap

Spiral wire tapping is a spiral type. Spiral wire tapping in tapping and to the spiral groove of the

upward rotating effect, able to easily put iron discharge hole, in order to avoid iron residue or the

blockage in the groove, resulting in a screw tap breaking edge crack.

Material: HSS

Color: Carbon black

-Growth in the service life and cutting out the highest accuracy of the thread.

-Spiral screw is suitable for cutting materials with high toughness, and is not suitable for cast iron

scraps into fine materials.