Material : High Speed Steel 4241 Type : N Type 118 degree Bit Diameter : 6.4mm/0.25" Cutting Edge Length : 72mm/2.83" Total Length : 101mm/3.98" Weight: 16g Main color: Silver HRC: 62-63 Package Content: 1pcs 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.