SCREWDRIVERS AND SCREWS

      The important indicators of quality screwdrivers are the kind of metal in the blade, finish and amount of grinding on the tip as well as material which used in the handle and bar attachment to the handle. For instance,If blade metal is low 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.

Screw heads are usually flat oval, or round, and each has a specific purpose for final seating and appearance.

Round-headed screws rest on top of the material and are easiest to remove.

TIPS ON SCREWDRIVER

1.	Lubricate screws with soap or wax for easier installation.
2.	Hold the work in a vise or clamp is the best ways to secure yourself when insert a screw. If can't do that, keep your hands and other parts of body away from the tip of driver.
3.	To remove a screw with a damaged slot another slot can be cut with a hacksaw blade if the head is exposed enough.
4.	A pilot hole (usually 2 sizes smaller than the shank of the screw) should always be made before driving a screw. This is especially crucial in hardwoods or when driving a screw near the end of the board. When working with screws of larger diameter, a pilot hole of the same diameter as the shank of the screw should be drilled into the wood to a depth of 1/3 the length of the screw.
5.	Always keep the screwdriver shank in line with the screw shank. This will avoid damaging the screw slot and pushing the screw out of line.