The 'common' or flat blade screwdriver works with slot headed screws and pre-dates other types of screw head by some considerable margin. Slot head screws are often preferred by restorers and makers of hand-made furniture, either because they are contemporary with the piece or because they are both aesthetically pleasing and inherently ill suited to mechanised production.
Narex wood line plus slotted screwdrivers have a flared tapered tip for maximum strength. The tips are finished with a black high friction coating, that also serves as a substrate for the high quality chrome plating applied to the rest of the tool.
The handles of the Narex wood line plus range are made from beech wood, stained black, and are triangular in section giving optimal comfort and transmission of torque from the hand. The tang of the driver goes right through, so they can be lightly encouraged with a mallet or small hammer if necessary. The bolster is hexagonal so that a spanner can be used to provide additional leverage for intransigent screws.
To prevent damage to either the driver or the screw head, always use the correct size and shape of driver for the screw.