TAPER taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes. Alpha Taper taps can be identified by the single ring on the shaft near the driving square.
Diameter: 4mm
Pitch: 0.7mm
Overall length: 45mm
Shaft Diameter: 4.5mm
Drive Square: 3.4mm
Tapping Drill Size: 3.30mm