Claw Knife
Screwdrivers – ToolsRUs
Screwdrivers are the mating tools that are used to turn different kinds of screws. Drivers are very basic in design, consisting of a steel shaft made with a certain head or tip and a handle to provide a grip on the tool. Available in numerous sizes and with drive heads to match all types of screws, screwdrivers are among the most commonly used tools. With it, you gain the mechanical advantage necessary to properly torque or apply rotational force to a machine element, screw or some other type of fastener. Screwdrivers are available in numerous manual varieties as well as electric and battery-powered models.
In terms of drive head style and size, the heads or tips of screwdrivers are designed to mate with a particular type of screw. The tip of the screwdriver is machined into a certain shape and serves as the male end, matching precisely with the appropriate drive type in the head of the fastener. The most common screw heads are Philips and slotted. Drivers built for slotted heads are nearly flat, resembling a paddle with a squared tip. The width and thickness of the flat tip determines what kinds of screws it can torque. By contrast, Philips head drivers consist of two perpendicular tips that form a perfect cross. At each of the four points of intersection, the inner corners are slightly rounded, forming four convex arcs.
The square-shaped Robertson head and the Frearson driver – which resembles a Philips head driver, but it is smaller and has no rounded inner corners – are other driver types. Specialty screwdrivers designed to work with other screws include mortorq, pozidriv and supadriv. These tools features unique, distinctly shaped heads. The mortorq driver features four wing-shaped tips, making it resemble a pinwheel when looked at straight down the tip. Nearly identical to the Philips head driver, a pozidriv head includes a second, thinner cross, but rotated 45 degrees relative to the main crossing tips. Supadriv heads feature squared-off inner corners at the points where the crossing tips meet, a modification of the Philips head design.
a few choices include nail bars, Hexagon Keys, nut drivers
Magnetic driver heads are commonly used to hold onto the fasteners, making for easier application. Shaft length varies from tool to tool, with longer models useful for reaching hard-to-reach screws. Other common features include drivers with changeable heads, giving you the ability to quickly switch between flathead and Philips head drivers or between driver heads of different size.
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