Screwdrivers

A variety of threaded fasteners used in the auto- motive industries are assembled by the use of a screwdriver. Each fastener requires a specific kind of screwdriver,and a body repairer should have several sizes of each type.
All screwdrivers,regardless of type,are designed to have several things in common. The size of the screwdriver is determined by the width or diameter of the blade and the length of the shank. It is important to select the blade tip accurately by matching it to the size of the slot or the type of fastener being used. The larger the handle,the better the grip and the more torque it will generate when turned.
Standard screwdriver (for slotted heads)
A slotted screw accepts a screwdriver with a standard tip. The standard tip screwdriver is proba- bly the most common type used. The blade should match the slot:an oversize screwdriver will not reach the bottom of the slot and an undersize
screwdriver will float in the slot,and either con-
dition could result in damage to the tool and the
fastener.
Phillips screwdriver (for cross-heads)

Phillips screws have a four-pronged funnel-shaped depression in the screw head,and are known as cross-heads. The tip of the Phillips screwdriver has four prongs that fit the four slots in the screw head. The four surfaces enclose the screwdriver tip so that there is less likelihood that the screwdriver will slip off the fastener. The most useful set of Phillips screwdrivers ranges from number 0 to number 4.
Pozidriv screwdriver
This screwdriver is like a Phillips in that the head is in the form of a cross,but the tip is flatter andblunter. The square tip grips the screw head and slips less than a Phillips screwdriver. Although Pozidriv and Phillips look alike,they are not interchangeable. The most useful set of Pozidriv screwdrivers ranges from number 1 to number 4.

Torx screwdriver
The Torx fastener is used quite a lot on vehicle bodies. The screwdriver has a six-pronged star profile which provides greater turning power and less slippage,and also ensures optimum pressure to prevent the tool from slipping out of the fastener’s head.

Speciality screwdrivers
These are normally in sets of screwdriver tips and assorted drivers which are all interchangeable and prove most useful in vehicle body repair work.