Material : High Speed Steel 4241 Type : N Type 118 degree Bit Diameter : 1.8mm/0.07" Cutting Edge Length : 22mm/0.87" Total Length : 45mm/1.77" Weight: 10g Main color: Silver HRC: 62-63 Package Content: 10pcs x Twist Drill Bit.
How to Use Twist Drill Bits
Ensure 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.
Note Mini twist drill bit can NOT be used in the impact drill. To avoid drill bit break, 1.8mm bits should be used with pin vise.