Now that we understand the basics of screw types and the importance of VDE certification it's time to look at the different types of screwdriver:
This is a slotted type screwdriver with a flared tip.
This is a slotted screwdriver with a parallel tip. This is designed for turning a screw at the bottom of a hole or in other restricted spaces.
This is a screwdriver where the blade goes right through the handle. At the top of the handle is a striking plate.
Why? Well one of the best techniques for releasing stuck screws is to place the screwdriver in the screw slot and give the top of the handle a sharp hit with a hammer.
Notice that the C.K strike-through screwdriver also has a square shaft. This is so that a spanner can be used for extra torque.
Watchmakers screwdrivers are very small screwdrivers designed for precision work. Their origin is obviously in watch making.
The difference to standard screwdrivers is that the end of the screwdriver handle spins. This is so that it can be held in place with the fore finger whilst the driver is turned between the thumb and middle finger.
Ratchet screwdrivers allows screws to be loosened or tightened without releasing grip on the handle. This is convenient for keeping a constant pressure on the screw and keeping the tip in place.
The drive can be changed from clockwise to anticlockwise rotation. In addition the ratchet can be locked so that the driver acts as a normal screwdriver.