Water pump pliers are basically channel lock pliers with large rounded jaws instead of the straight ones. My pair can easily encompass a 4" circle or go down a notch to cover a 3" circle. They are very handy for undoing oil filters in autos and pipe joints on ABS pipe.

The wrong one won't engage the whole screw head, which increases the risk of stripping out the star pattern when you try to tighten/undo the screw. And w/o the star pattern, tightening or removing the screw becomes quite hard.

Calipers are used for measuring small thicknesses and widths, not making holes.

"Outside calipers" look like tongs and could stab through lightweight material, but that is not the primary function.

Each tool has its own cleaning procedures.

1. Using a wire brush/paint brush/cotton waste thoroughly brush/wipe hand tools.

2. If found rusted/corroded use proper abrasive to rub and remove rust/corrosion.

3. Apply anti-rust/corrosion agents.

4. Insert in proper casings.

5. Input anti moisture substances inside casing to absorb if humidity trapped inside.

6. Keep tool and casing in a dry place.

7. While taking for use brush/wipe out anti-rust/corrosion agents applied earlier to avoid slippage on use hence damage.

8. Try do not touch metal parts with hand to avoid sweat on parts which may cause rusting/corrosion.

9. Use gloves while cleaning hand tools.

10. Ensure cleaning is done every day before keeping it aside.

To eliminate short circuiting, to enable and supply reliable and correctly rated power supply, fool proof handling of connection points and equipments during the time of servicing and maintenance.

Safety is important when handling any tool.
First thing that should be done is to read the manual that comes with the tool kit.
If possible wearing heavy duty gloves and goggles will add to the persons safety.

Drill bits are not universal. You choose the size of the drill bit according to the size of hole you like to make.

A flat head screwdriver is a tool that is used on screws that have a single slot on the screw's head.

A wrench is used to tighten nuts. Socket wrenches are a type of nut driver.

If you don't maintain them , they'll wear and break faster.

If you don't maintain them, they produce poorer results.

Dull cutting tools leaves a chewed-up cut instead of a nice, smooth one as an example.

When you can't use that tool any more, you'll either have to stop working while you go and buy a new tool - which will cost you both time and money.

Or pick a poorer tool and work slower, also costing you time.

Tools that get worn can also be dangerous, both to the user, to the surroundings and to other people around you. A tool that get you damaged will make you miss work, costing you time. A tool that destroys the piece you're working on, or something right nearby will force you to do repairs. That means added work and cost, and again lost time.

A tool that damages someone else can get you sued, or even jailed.

All good reasons to maintain your tools.

Usually a tack hammer. But a brad driver that resembles an awl may be used.

A Philips head screwdriver, unlike a flat head screwdriver is slightly tapered to the point and has a characteristic + point or nose.

Screws with a "Phillips head" have an inverse + profile rather than a single groove of a normal screw.

This means that when the screwdriver is inserted into the screw is catches at 4 points (along the +), rather than along a single line. If you add up the surface area of the groove of a Philips screw to a similar (similar size) single groove screw you will notice that is is much larger; this means that the screwdriver has more surface area on the screw head and that it is divided over 4 contact points. This allows the Philips screw to be tightened with more torque than a traditional screw before the head shears off.

An electrician would be one person that would use them.

Using for driving the screw to a particular location. A flat screw driver is using for driving cheese head or countersunk screw having slot at its head.

Cannot be treated as a machine but a lever mechanism.

An Allen wrench, or "hex key" is tool used to turn Allen screws or bolts. They come in various sizes, both SAE and metric, and may be single, or foldable into little sets that look like Swiss Army Knives. The heads are far more unlikely to strip out than Phillips or slotted screws, and are often used in, and included with "assemble it yourself" furniture like Ikea stuff. You just insert the end in the screw and turn. Lefty-loosey-Righty-tighty.