VÖLKEL-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 minimupower of 7.5 Volts. Take care that the tool and the axis of the hole are exactly aligned and use a suitable cutting oil.