Phillips head screwdrivers come in sizes from 0 to 4. The lower the number, the larger the tip. Most jobs can be handled by a No. 2, like this 7-inch option from Klein.

The screwdriver is one of the most fundamental and universal tools. Attack any job with one of these best screwdriver sets from Stanley, Craftsman, and others.

Unlike hammers, though, screwdrivers are only really useful if you have the right size, so it’s best to get a set of screwdrivers that features multiple different sizes, rather than just one.

JIS screwdrivers are available from sizes 000 to 0 (very small, precision-type screwdrivers for electronics) to 1 and 2 (more useful for motorcycles). Note that a JIS screwdriver will usually work on ...

The size is also kind of perfect. It’s big enough to get good traction in your hand, but so small that it easily tucks into a pocket. Even that weird little mini-pocket that some pants have.

Simply stroke a very strong magnet (from a hard drive works well) along the shaft to magnetize a tool. For a laptop or cell phone type repair, you should get a good set of screwdrivers.