The screwdriver should fill the screw slot or head completely or come within 1/16" of doing so. If the tip is too small, the driver will not have enough bite to turn the screw and will slip, stripping the head. If the tip is too large, it will not seat all the way to the bottom of the screw's head and will strip the top portion of the head. Ideally, when you seat the driver in the screw head there shouldn't be any play or slop between the two. At worst, there shouldn't be more than 1/32" of play. It's best is to have a full set of sizes so you're not tempted to use the wrong size driver and take the chance of stripping out a screw head. Quality screwdrivers are judged by the kind of metal in the blade, finish and amount of grinding on the tip. Material used in the handle and bar attachment to the handle are other quality indicators. If blade metal is poor quality, it will chip and crumble under pressure. If the tip is improperly ground and flares too much, it will rise out of the screw slot. If the blade is not attached firmly to the handle, it will eventually loosen and slip in the handle.

Screwdriver Tips:

Several types of screwdriver tips are available-regular, cabinet, Phillips, Frearson, Torx, clutch- head, hex, Bristol multi-spline and square-tipped. Regular tips are used with large, heavy screws. Tip is flared so it is wider than the driver bar. Quality drivers with regular tips should be accurately ground for uniformity. Blades should not taper too sharply from the tip, because an improperly tapered tip has a tendency to rise out of the screw slot. Cabinet tips are similar to regular tips, but have no flare. They are straight for use with small screws and countersinking screws where regular tips with a flare would mar the wood or material on the side. Phillips-head drivers are used on cross-slotted screw heads with modified U-shaped slots of uniform width.

Spiral-Ratchet Screwdrivers:

A spiral-ratchet screwdriver uses a mechanism similar to a push-pull drill. It has an adjustable chuck to permit interchanging different size driver tips and drill points. Ratchets are designed to drill and remove screws. Driving action is provided by pushing straight down on the handle.

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