Second-level straight handle custom-made stepped drill step drill bit screw countersunk head drill bit second-level drill mother drill bit metal drilling
Note that the angle refers to the step position angle black M3 (minor diameter 3 4 major diameter 6 5) 90 or 180° black M4 (minor diameter 4 5 major diameter 8) 90 or 180° black M5 (small diameter
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