6.9mm Twist Drill High Speed Steel Bit HSS-4241 for Steel, Aluminum Alloy 2pcs

Description:

Material : High Speed Steel 4241

Type : N Type 118 degree

Bit Diameter : 6.9mm/0.27"

Cutting Edge Length : 76mm/2.99"

Total Length : 109mm/4.29"

Weight: 40g

Main color: Silver

HRC: 62-63

Package Content: 2pcs 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.