Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver. Standard slot screwdriver sizes (ISO 2380). Slotted drives Slot drive tool and screw sizes Blade width These sizes do not necessarily describe a particular dimension of the drive shape, but rather are arbitrary designations. Most heads come in a range of sizes, typically distinguished by a number, such as "Phillips #00". The following heads are categorized based on frequency, with some of the less-common drives being classified as "tamper-resistant." Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. At a minimum, a screw drive is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it.
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