HSS-4241 5.8mm High Speed Steel Twist Drill for Steel Aluminum Alloy 5pcs

Description: Material : High Speed Steel 4241 Type : N Type 118 degree Bit Diameter : 5.8mm/0.23 Cutting Edge Length : 67mm/2.64 Total Length : 93mm/3.66 Weight: 60g Main color: Silver HRC: 62-63 Package Content: 5pcs 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.