VĂ–LKEL-Threading-Bits have been designed for thread cutting using battery-powered screwdriver drills and electric hand drills with right-hand and left-hand rotation. 
But they are also suitable for thread cutting by hand or in a stationary drilling machine.
Your battery-powered screwdriver drill should have a minimum power of 7.5 Volts.
Take care that the tool and the axis of the hole are exactly aligned and use a suitable cutting oil.
The following technical data apply for thread cutting using battery-powered screwdriver drills and eletric hand drills:
 

Dimensions

M 3

M 4

M 5

M 6

M 8

M 10

Core hole dia.

2,5 mm

3,3 mm

4,2 mm

5,0 mm

6,8 mm

8,5 mm

RPM

lowest setting (0 - 450 RPM)

Torque

Maximum setting