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Description:How to Use Twist Drill BitsEnsure the left and right cutting edges of the drill are symmetrical when drilling.Observe the uniformity of the spark while drilling, adjust the pressure in time, and pay attention to the cooling of the bit. NoteMini twist drill bit can NOT be used in the impact drill. Specifications:Material : High Speed Steel 6542(M2)Type : N Type 118 degreeShank / Cutting Edge Diameter : 9.5mmCutting Edge Length : 80mmTotal Length : 123mmPackage Content: 1pcs x Twist Drill Bit