The driver bit fits with a screw quickly
without scratching or damaging the screw head.

1.

The guiding section leads the driver bitinto the screw recess (guiding).

2.

The locking section leads the driver bit into the screw recess center (locking).

3.

A slight rotation of the driver bit completes fitting to the screw.

The bit does not fit with a screw easily and is likely to
scratch or damage the screw head.

1.

The driver bit cannot be led into the screw recess easily.

2.

The driver bit cannot be guided to the center of the screw recess.

3.

The driver bit freewheels on the screw head and does not easily fit with the screw.