The tool used to drive a slotted screw head is called a flat-blade screwdriver. This last usage can sometimes be confusing, because the term "flat-head" is also used to describe a screw with a flat top, designed to be installed in a countersunk hole. Such a flat-headed screw may have a slotted, cross, square recessed, or combination head, causing further confusion about the terminology.
Among slotted screw drivers, there are a couple of major variations at the blade or bit end involving the profile of the blade as viewed face-on (from the side of the tool). The more common type is sometimes referred to as keystone, where the blade profile is slightly flared before tapering off at the end. To maximize access in space-restricted applications, the cabinet variant screwdriver blade sides are straight and parallel, reaching the end of the blade at a right angle. See figure 1 for example.
(Figure 1)
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