The screwdriver is a type of cordless screwdriver that uses a hexagonal holder for 1/4 bits instead of the standard 13 mm handle. The main reason why you should consider purchasing this type of device is the extremely high torque. Due to the high torque available, you will be able to drive long, wide screws very quickly into even the hardest materials. Unscrewing stuck screws or bolts is a piece of cake for this type of device. The work of screwdrivers is carried out in stages. In the first phase, the device provides us with a fast rotational movement, and in the final stage it changes to a slow impact movement.