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.

Other information's:

To remove the clutch housing from the tool to expose the clutch one can grasp the motor housing firmly with one hand and with the other hand, grasp the clutch housing firmly. One can turn the clutch housing clockwise and continue rotation until the clutch housing falls away from the tool. To install the clutch housing back onto the tool one can grasp the motor housing firmly with one hand and with the other hand, grasp the clutch housing. One can thread the clutch housing onto the tool by rotating the clutch-housing counter clockwise until the clutch housing is tight against the motor housing. One should be careful not to over-tighten. To prevent cross threading, start threading the clutch housing gently onto the motor housing until it gets started.

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.

Stainless Steel Deck Screw:
These screws are highest corrosion resistance, better holding power and no cam-outs or stripping when installing. Another specialty of these screws is that unlike square drive fasteners, the star or Torx drive recess holds the insert bit more...

Thumb screw stainless steel:
There is almost nothing aboard a boat that can't be fastened with the self-tapping screw. Self-tapping screws are, of course, ideal for screwing into thin, hard metals or even moderately thick soft metal such as aluminum. All it takes is a pilot...

Torx screwdrivers:
have been developed to maximize efficacy for particular applications. These screwdrivers are usually arranged by category, as with a rack of screwdrivers, and within each category there are often several different sizes and types, such as Phillips,...